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IntroductionSon preference, an ongoing concern in India, is a known driver of ideal family size preferences and contraceptive use among couples. These associations can vary substantially with parity and can influence men and women differently. This study assesses the association of sex composition of children by parity and a) men's higher ideal family size preference relative to women and b) use of modern contraceptives by couples.MethodsWe used the Couples Recode dataset from National Family Health Survey (NFHS) 2015-16 and identified couples who had at least one child and had complete responses for variables used in the study (N = 56,731 couples). We developed multivariable linear and logistic regression models to study the association between sex composition of children by parity and our dependent variables.ResultsOur findings indicate that the sex composition of children is associated with men's higher ideal family size preference, relative to women, among couples with four or more children. We also find that couples with less than four children are less likely to use modern contraceptives when they have an equal or a greater number of daughters than sons compared to those who have no daughters. Findings suggest that couples with four or more children are more likely to use modern contraceptives when they have at least one son and one daughter and are less likely to use contraceptives when they have all daughters and no sons, than couples who have no daughters.ConclusionThis study contributes to existing research on the relationship between sex composition of children with ideal family size preferences and contraceptive use by highlighting meaningful differences between higher and lower parity couples. Findings from the study can be used by family planning programs in India to customize family planning counselling messages by both sex composition and parity.

We examine the degree to which parental gender preferences in the USA have changed over time. To quantify levels of parental sex preference, we compare the likelihood that mothers have a third child given the gender makeup of their first two children. We construct a novel dataset of women's fertility histories using full-count censuses from 1850–1880 and 1900–1940 and extend the sample to 2019 using more recent datasets. We find a preference for having a mix of genders with only a small preference for sons. We find that a woman is about 2 percentage points more likely to have a third child if the sex of her first two children is the same, and this effect was very stable from 1850 to 1940. In contrast, we find that this effect gets much larger after 1940, reaching a high point in 1990–2000 of about 6–7 percentage points. [ABSTRACT FROM AUTHOR]

Copyright of African Journal of Reproductive Health is the property of Women's Health & Action Research Centre and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A comparative analysis of reproduction in two local populations of Libyan Jird (Meriones libycus) inhabiting in the semi-desert areas and foothill steppes of Azerbaijan, the Jeyranchol population is met most in the Western and the Absheron population most in the Eastern of Azerbaijan. The studied reproductive characteristics (sex composition, the relative ratio of the pregnant females and number of the embryos) are subject to the seasonal variation and geoclimatic factors determine largely the breeding success, according to observed indicators higher in the Jeyranchol population. [ABSTRACT FROM AUTHOR]

Based on ecosystem survey data in the Barents Sea in August–October 2004–2021. the results of studies of the distribution and size-sex composition of seven species of skates (Amblyraja radiata, Amblyraja hyperborea, Rajella fyllae and Bathyraja spinicauda as well as Dipturus oxyrinchus, Leucoraja fullonica and Rajella lintea), as well as estimates of the abundance and biomass of four common skate species. An expansion of the area and the northern and/or eastern boundaries of the distribution of warm-water boreal species of skates (round, spinytail) and some increase in their abundance and biomass were revealed. At the same time, a decrease in the abundance and biomass of the Arctic skate and a shift in its distribution to the cold-water part of the Barents Sea were noted. Significant changes in the size and sex composition of the majority of skate species were not revealed. [ABSTRACT FROM AUTHOR]

Abstract Background School injuries are an important adolescent health problem. Previous research suggests that relevant risk behaviors for school injuries, risk-taking and aggression, are highly susceptible to peer effects. Specifically, evidence suggests that the ratio of men and women in peer groups (sex ratio) affects individuals’ propensity for aggression and risk-taking. However, potential associations of classroom sex ratios with adolescent school injury risks have not been studied so far. The purpose of this paper is to investigate the association of classroom sex compositions with adolescent school injuries. Methods We investigate the association of classroom sex ratios with school injuries in a longitudinal survey dataset containing 13,131 observations from 9,204 adolescent students (ages 13-16) from secondary schools in Germany. The data also allow us to identify injuries due to aggressive behavior and analyze these injuries in detail. We use multilevel logistic regression models to analyze risks of both overall and aggression-related school injuries. Results Adolescent students’ risk for school injuries is significantly and positively associated with male-skewed classroom sex ratios (OR = 1.012, p=0.012). Specifically, the risk of sustaining a school injury increases by 33.5 percent when moving from the 10th to the 90th classroom sex ratio percentile. Moreover, we find an even stronger positive association between male-dominated classrooms and aggression-related injury risks (OR = 1.022, p=0.010). Compared to classroom sex ratios at the 10th percentile, the risk of an aggression-related injury is 78 percent higher in classrooms with a sex ratio at the 90th percentile. Finally, we find that both boys’ and girls’ injury risks equally increase with a higher proportion of male students in their classroom. Conclusions Our findings indicate that sex composition of classrooms is an important contextual factor for adolescent school injuries, in particular school injuries resulting from aggression. These findings illustrate the need to integrate a contextual perspective on school injuries among adolescent students both into research and into intervention planning.

Research on joint action has demonstrated that individuals are sensitive to a coactor’s attentional relation to jointly attend stimuli. It has also been suggested that some features are necessary to resolve the discrimination problem (i.e., self-own and other-own actions). In the present study, we aimed to test whether the gender composition of interacting pairs modulated the joint action effect. Same- (female-female or male-male) and mixed- (female-male) gender pairs performed a joint version of flanker tasks in Experiment 1 (90 participants, 50% males), while in Experiment 2 (154 participants, 50% males) Navon tasks were performed. In Experiment 1, a higher joint flanker effect in same-gender pairs than in mixed-gender pairs, and this joint effect was similar to the classical flanker effect reported by males and females in a classical procedure of the task (70 participants, 50% males). In Experiment 2, the same-gender pairs reported a joint Navon effect, which was reversed in mixed-gender pairs. In conclusion, our findings support how the gender composition of interacting pairs plays a role in joint attentional tasks.

A neglected consequence of declining fertility is the likely rise of families with children of one sex--only sons or only daughters. Increases in such families present important demographic shifts that may weaken patrilineal family systems. We assess whether sons-only and daughters- only families rose in Asia and North Africa from the early 1990s to around 2015. Using 88 surveys and two censuses, we examine how the number and sex composition of children of mothers aged 40-49 changed across 20 countries, representing 87% of the region's population and 54% of the global population. We also compare observed trends to sex-indifferent counterfactuals, quantify contributions of fertility declines with decompositions, and investigate subnational trends in China and India. Increases in sons-only families were universal where numbers of children fell. Growth of daughters- only families was suppressed in patrilineal contexts, but these sonless families still rose significantly in 13 of 18 countries where numbers declined. By 2015, over a quarter of families in the region had only sons and nearly a fi fth only daughters. There was considerable variation across countries: recent levels ranged from 28.3% to 3.4% daughters- only and from 40.1% to 6.0% sons-only. China and the rest of East Asia had the highest shares. [ABSTRACT FROM AUTHOR]

Introduction: Son preference, an ongoing concern in India, is a known driver of ideal family size preferences and contraceptive use among couples. These associations can vary substantially with parity and can influence men and women differently. This study assesses the association of sex composition of children by parity and a) men's higher ideal family size preference relative to women and b) use of modern contraceptives by couples. Methods: We used the Couples Recode dataset from National Family Health Survey (NFHS) 2015-16 and identified couples who had at least one child and had complete responses for variables used in the study (N = 56,731 couples). We developed multivariable linear and logistic regression models to study the association between sex composition of children by parity and our dependent variables. Results: Our findings indicate that the sex composition of children is associated with men's higher ideal family size preference, relative to women, among couples with four or more children. We also find that couples with less than four children are less likely to use modern contraceptives when they have an equal or a greater number of daughters than sons compared to those who have no daughters. Findings suggest that couples with four or more children are more likely to use modern contraceptives when they have at least one son and one daughter and are less likely to use contraceptives when they have all daughters and no sons, than couples who have no daughters. Conclusion: This study contributes to existing research on the relationship between sex composition of children with ideal family size preferences and contraceptive use by highlighting meaningful differences between higher and lower parity couples. Findings from the study can be used by family planning programs in India to customize family planning counselling messages by both sex composition and parity.

Men and women's diverging fields of study choices contribute to the gender wage gap among highly educated workers in several countries, yet systematic cross-national comparisons are rare. Using data from the German Socio-Economic Panel Study, the German Microcensus, and Statistics Finland this study explores whether fields of study shape the gender wage gap differently in Germany than in Finland; two countries that display strong linkages between education and employment, but differ in the generosity of family policies. The results show that fields of study are an important source of gender wage disparities in both countries. In Germany, associations between characteristics of fields and wages do not seem to differ between the genders. In Finland, the findings suggest that women profit more than men from fields with strong linkages to occupations. Our findings highlight that research analyzing the association between fields of study and gender inequality needs to consider institutional features and gender-specific patterns. [ABSTRACT FROM AUTHOR]

Demographic forecasts are a base of modern social policy. The future of the Russian Federation depends on the reproduction of the population. The author considers the expected number and life expectancy of the population of the country’s third largest region.

Background & aim: A number of studies have addressed the positive effects of parental gender preferences for children on fertility in Iran. However, new demographic situations have left two questions unanswered: whether parents demonstrate gender preferences for children in a modern low-fertility society and if so whether such a preference is a strong predictor of the probability of having another child. Methods: This cross-sectional survey was conducted on 450 married men and women residing in Tehran, Iran in 2014. The Data collection tool included a self-structured questionnaire entailing a demographic information form, fertility intention, and gender preference-related data. The data were analyzed in SPSS Software (version 24) using cross tabulation estimation and logistic regression. Results: 22.2% of men and 17.11% of women were reported to be in favor of having daughter, while 12.9% of men and 14% of women preferred son. Moreover, gender preference was found to have no significant effect on fertility intention. However, the women with same-sex children were 3.17 times more likely to desire another child, compared to those who have different sex composition (OR=3.178, P value= 0.000). Furthermore, the men in the age groups of ≤30 and 31-40 desired to have another child, compared to older men. Conclusion: While a preference for son is rooted in Iranian culture, a new gender preference is emerging with a strong tendency toward having a girl. However, gender preference was not a driving force in the continuation of fertility in the context of low fertility of Tehran.

Objective: To investigate the relationship between sex-composition of children and women’s fertility desire in Vietnam. Materials and methods: Using data from the 2014 Vietnam Multiple Indicator Cluster Survey (MICS), we investigate the association between sex composition of children and desire for additional children among women in reproductive age (15 to 49 years) across Vietnam (N=5,605). Results: Multivariate logistic regression models showed statistically significant association between sex composition of children and women’s fertility desire, after controlling for social norms of fertility preference, demographic and socioeconomic factors. For each group of women (those with one child, two children, and three or more children) women with no sons are more likely to have higher fertility desire compared to women with at least one son. However, women with both son (s) and daughter (s) tend to have lower fertility desire compared to those who have all sons. Conclusion: Vietnam’s traditional cultural norm of son preference has a strong influence on fertility desire. Besides, mix-gender preference is also documented. The government should enforce the law more strictly regarding the prohibition of ultrasounds to detect fetal sex to reduce the feasibility of sex selection abortion. In addition, the government should improve the social ideology of the role of women in the family and society through mass media.

Abstract Background Sex composition of living children within the context of “sex preference” and its association with various reproductive health outcomes has been extensively studied in South and South East Asia. Although sex preference has been observed in sub-Saharan Africa, there is paucity of research on sex composition of living children and its association with reproductive health behaviours and outcomes, particularly in a matrilineal inheritance system. The purpose of the study was to explore the existence of sex preference in a matrilineal inheritance system. Specifically, the study sought to better understand the issues by examining the sex composition of living children and how it is associated with reproductive outcomes such as pregnancy intendedness and intention to use postpartum family planning among women in a matrilineal area of Ghana. Methods This was a cross sectional study conducted at four selected health facilities in the Mfantseman municipality of the Central Region of Ghana. Out of the 1914 pregnant women attending antenatal clinic selected using total enumeration, from 2nd January to 30th April 2012, 1091 with living children and complete socio-demographic data were recruited for this study. Descriptive, chi square and multivariate logistic regression analyses were conducted. Results The mean age of the 1091 respondents in this study was 28.2 ± 6.0 years with mean gestational age of 26.7 ± 6.6 weeks. Whilst 78% of the women had at least a son, 71% had at least a daughter, with those having only sons exceeding those with only daughters by 6.3%. Also, majority of the women with more sons than daughters did not intend their current pregnancies. These observations, coupled with a sex ratio of 109 males to 100 females, inferred the existence of son preference. The levels of unintended pregnancy and intention to use postpartum family planning were high (70% and 78% respectively). There was an association between sex composition of living children and unintended pregnancy but no association between sex composition of living children and intention to use postpartum family planning. Women with only sons were 50% less likely to have unintended pregnancies compared to those with equal number of sons and daughters [AOR 0.5, 95% CI (0.3–0.8)]. Similarly, women over 30 years were 80% less likely to have unintended pregnancies compared to those 15–19 years [AOR 0.2, 95% CI (0.1–0.6)]. The women with parity of 5 or more and resident in Anomabo were more likely to have unintended pregnancy compared to those with parity of up to two [AOR 3.8, 95% CI (1.7–8.59)] and those resident in Saltpond [AOR 1.8, 95%CI (1.1–2.8), respectively. In addition, the women resident in Anomabo were more likely to have intention to use postpartum family planning compared to those in Saltpond [AOR 1.8, 95% CI (1.0–3.3)]. Conclusion There was persistence of more sons than daughters born in a predominantly matrilineal inheritance system and sex composition of living children had significant association with pregnancy intendedness but not with intention to use postpartum family planning.

Objective: To investigate the relationship between sex-composition of children and women's fertility desire in Vietnam. Materials and methods: Using data from the 2014 Vietnam Multiple Indicator Cluster Survey (MICS), we investigate the association between sex composition of children and desire for additional children among women in reproductive age (15 to 49 years) across Vietnam (N=5,605). Results: Multivariate logistic regression models showed statistically significant association between sex composition of children and women's fertility desire, after controlling for social norms of fertility preference, demographic and socioeconomic factors. For each group of women (those with one child, two children, and three or more children) women with no sons are more likely to have higher fertility desire compared to women with at least one son. However, women with both son (s) and daughter (s) tend to have lower fertility desire compared to those who have all sons. Conclusion: Vietnam's traditional cultural norm of son preference has a strong influence on fertility desire. Besides, mix-gender preference is also documented. The government should enforce the law more strictly regarding the prohibition of ultrasounds to detect fetal sex to reduce the feasibility of sex selection abortion. In addition, the government should improve the social ideology of the role of women in the family and society through mass media. [ABSTRACT FROM AUTHOR]

While studies in high-income countries have shown that failure to achieve fertility desires is significantly associated with unfavourable personal circumstances, there is barely any empirical evidence on the factors that influence the pattern of unrealized fertility in sub-Saharan Africa. Using data from the 2018 Nigeria Demographic and Health Survey, this paper investigates the roles of ethnicity and the sex composition of living children on unrealized fertility in Nigeria. The results show that the odds of having unrealized fertility were higher among Hausa–Fulani women compared with women of other ethnic groups in Nigeria. Also, having daughters only (no sons) was associated with higher odds of unrealized fertility, after controlling for other important covariates. The findings suggest that cultural norms and pronatalism significantly influence the fertility desires of women in Nigeria, even at the end of their reproductive lifespan. [ABSTRACT FROM AUTHOR]

Abstract Background The sex composition of existing children has been shown to influence childbearing decision-making and behaviors of women and couples. One aspect of this influence is the preference for sons. In India, where son preference is deeply entrenched, research has normally focused on rural areas using cross-sectional data. However, urban areas in India are rapidly changing, with profound implications for childbearing patterns. Yet, evidence on the effect of the sex composition of current children on subsequent childbearing intentions and behavior in urban areas is scant. In this study, we analyze the impact of sex composition of children on subsequent (1) parity progression, (2) contraceptive use, and (3) desire for another child. Methods We analyze prospective data from women over a four year period in urban Uttar Pradesh using discrete-time event history logistic regression models to analyze parity progression from the first to second parity, second to third parity, and third to fourth parity. We also use logistic regression models to analyze contraceptive use and desire for another child. Results Relative to women with no daughters, women with no sons had significantly higher odds of progressing to the next birth (parity 1 – aOR: 1.31; CI: 1.04–1.66; parity 2 – aOR: 4.65; CI: 3.11–6.93; parity 3 – aOR:3.45; CI: 1.83–6.52), as well as reduced odds of using contraception (parity 2 – aOR:.58; CI: .44–.76; parity 3 – aOR: .58; CI: .35–.98). Relative to women with two or more sons, women with two or more daughters had significantly higher odds of wanting to have another child (parity 1 – aOR: 1.33; CI: 1.06–1.67; parity 2 – aOR: 3.96; CI: 2.45–6.41; parity 3–4.89; CI: 2.22–10.77). Conclusions Our study demonstrates the pervasiveness of son preference in urban areas of Uttar Pradesh. We discuss these findings for future programmatic strategies to mitigate son preference in urban settings.

We examine the impact of the Allowance for Newborn Children, a universal baby bonus offered by the Canadian province of Quebec, on birth order, sibship sex composition, income, and education. We find a large response for third- and higher-order births for which the bonus was more generous. Interestingly, though, we find stronger response if there were two previous sons or a previous son and daughter rather than two previous daughters. We also find, in addition to a transitory effect, a permanent effect, with the greatest increase in one daughter-two son families among three-child households. Moreover, we find a hump shape response by income group, with the greatest response from middle-income families. Also, women with at least some post-secondary education respond more to the policy than those with less. These findings suggest that properly structured pro-natal policies can successfully increase fertility among different segments of the population while simultaneously diminishing the effect of gender preferences and fertility disparity related to women's education. [ABSTRACT FROM AUTHOR]

Calanus sinicus is a calanoid copepod widely distributed in coastal waters of China and Japan, and oversummering strategies may have major impacts on their population dynamics which in turn affect local marine food web structure. The abundance, stage composition, and sex composition of the planktonic copepod C. sinicus were studied from August to October 2002 in the southern Yellow Sea to understand how its population recovers from the over-summering state. Results showed that C. sinicus had low reproduction in August due to high temperature, except in waters near the Cheju Island with rich food and moderate bottom temperature, but the reproduction rates here decreased in September-October as food availability declined. When temperature dropped in September-October, C. sinicus actively propagated in coastal shallow waters. However, reproduction rates of C. sinicus individuals inhabiting the Yellow Sea Cold Water Mass (YSCWM) remained low during the three months of the study. The percentage of C. sinicus females was high during the reproductive period, which suggests that the sex composition of adult C. sinicus may reflect whether or not the population is in the reproductive mode. Numerous fifth copepodite stage (CV) C. sinicus aggregated in the YSCWM in a suspended developmental stage during the three months of this study, and they potentially served as the parental individuals for population development when conditions became optimal for reproduction later in the year. [ABSTRACT FROM AUTHOR]

Sex composition of groups has been theorized in organizational sociology and found in prior work to structure female and male members' behaviors and experiences. Peer group and gang literature similarly finds that the sex gap in offending varies across groups of differing sex ratios. Drawing on this and other research linking gang membership, offending, and victimization, we examine whether sex composition of gangs is linked to sex differences in offending in this sample, further assess whether sex composition similarly structures females' and males' victimization experiences, and if so, why. Self-report data from gang members in a multi-site, longitudinal study of 3,820 youths are employed. Results support previous findings about variations in member delinquency by both sex and sex composition of the gang and also indicate parallel variations in members' victimization. These results are further considered within the context of facilitating effects such as gender dynamics, gang characteristics, and normative orientation. [ABSTRACT FROM AUTHOR]

Married individuals match with spouses who share their occupation more frequently than should happen by chance if marriage markets are large frictionless search markets covering a particular geographic area. This suggests that either there is a preference for same-occupation matches or that search costs are lower within occupation. This paper uses 2008-2015 data from the American Community Survey to analyze same-occupation matching among a sample of recently married couples. Our empirical strategy compares the difference in wages between same-occupation husbands and different-occupation husbands across occupations with different percent male workers. Under a preference explanation, this difference should become less negative as the share of males in the occupation increases. Under a search cost explanation, this difference should become more negative as the share of males increases. Our results are consistent with the search cost explanation. Furthermore, using an occupation-specific index of workplace communication, we demonstrate that the results are most consistent with the search cost mechanism for occupations with a greater degree of workplace communication. Finally, we show that matching on field of degree for couples in which both spouses have a college degree is also consistent with the search cost explanation. [ABSTRACT FROM AUTHOR]

Background: Studies on children and divorce in China find a negative association between the number of children and divorce and a protective effect of having a son. Nonetheless, we have little knowledge of how these associations have developed over time. Objective: This study explored the association of the number and sex composition of children with divorce risks in China over the period 1980-2012. Methods: We conducted an event history analysis of longitudinal data from the China Family Panel Studies. Results: Childless couples had an increasingly higher divorce risk than couples with children over our observation period. In the 2000s, the divorce risk of childless couples in both urban and rural areas was approximately five times that of one-child parents. The role of the child's gender differs for urban and rural one-child parents, with no significant effect on the divorce risk of urban parents and different effects over time for rural parents. Conclusions: Our findings show that ending a marriage when having no children has become an increasingly pronounced trend. Furthermore, partially due to the rapid socioeconomic and demographic progress and the rise of girls' empowerment, the child's gender has lost importance for the divorce risk of urban parents. Contribution: This study enriches our knowledge about the association between children and divorce risks in a rapidly developing society. Indirectly, the study also informs us about the evolution of son preference in China.

Achievement of Sustainable Development Goals (SDGs), especially goals one (end all forms of poverty), three (ensure healthy lives and promote well-being for all at all ages), four (ensure inclusive and equitable quality education and promote life-long learning opportunities for all) and five (achieve gender equality and empower all women and girls) might be a mirage without conscious efforts on the part of many developing countries to reduce population growth. Rapid population growth due to a high fertility rate and fertility desire may engender strife, poverty, unemployment, competition for scarce resources.The study explored the influence of sex composition of living children on childbearing intention among high fertility married women in stable union. This was a cross-sectional descriptive study and the study population were married women with high fertility in stable union. Results showed that sex composition of surviving children were significantly associated with respondents' fertility intentions. The following were the predictors of fertility intentions; sex composition of surviving children, type of family, contraceptive use, child parity, women empowerment status and others. Sex composition of surviving children was significantly associated with the fert ility intentions of the high fertility married women in stable union., Competing Interests: The Authors declared no conflict of interest, (African Journal of Reproductive Health © 2023.)

Successful social interaction requires the ability to integrate as well as distinguish own and others' actions. Normally, the integration and distinction of self and other are a well-balanced process, occurring without much effort or conscious attention. However, not everyone is blessed with the ability to balance self-other distinction and integration, resulting in personal distress in reaction to other people's emotions or even a loss of self [e.g., in (subclinical) psychosis]. Previous research has demonstrated that the integration and distinction of others' actions cause interference with one's own action performance (commonly assessed with a social Simon task). The present study had two goals. First, as previous studies on the social Simon effect employed relatively small samples ( N < 50 per test), we aimed for a sample size that allowed us to test the robustness of the action interference effect. Second, we tested to what extent action interference reflects individual differences in traits related to self-other distinction (i.e., personal distress in reaction to other people's emotions and subclinical psychotic symptoms). Based on a questionnaire study among a large sample ( N = 745), we selected a subsample ( N = 130) of participants scoring low, average, or high on subclinical psychotic symptoms, or on personal distress. The selected participants performed a social Simon task. Results showed a robust social Simon effect, regardless of individual differences in personal distress or subclinical psychotic symptoms. However, exploratory analyses revealed that the sex composition of interaction pairs modulated social Simon effects. Possible explanations for these findings are discussed. [ABSTRACT FROM AUTHOR]

The effects of sex composition of dyads and surrounding others in groups on the accuracy in women’s expected evaluations (metaperceptions) were investigated using the Group Actor-Partner Interdependence Model (GAPIM). The dataset comprised 26 groups of four to six previously unacquainted participants who completed an unstructured social interaction followed by round-robin evaluations and metaperceptions on evaluative adjectives. Women expected less positive evaluations from opposite-sex partners, and this did not vary by the sex composition of surrounding others. However, women were less accurate in predictions of how they were evaluated by male partners (compared with female partners) if women were the majority in the surrounding group. Also, women formed less accurate metaperceptions of female partners when women were the minority, rather than the majority in the surrounding context. Implications for theory development in intergroup relations and contributions of the GAPIM to diversity research are discussed. [ABSTRACT FROM AUTHOR]

The decapod crustaceans Eurypodius latreillii (Brachyura) and Pagurus comptus (Paguridae) were the most frequently occurring species in Agassiz trawl (AGT) samples obtained during the Chilean - German - Italian Victor Hensen Expedition in the Straits of Magellan and south of the Beagle Channel. Sex composition and length structure aspects were studied using the material from 15 stations in the two areas, which comprised 773 specimens of E. latreillii and 647 P. comptus. The size frequency of both species was characterized by the presence of small individuals in shallow waters. The sex composition varied with depth, indicating a dominance of E. latreillii females in deep waters, whereas no such pattern was observed in P. comptus. These differences may be caused by epizoites of E. latreillii and the availability of vacant gastropod shells for P. comptus, in addition to geographical aspects and life-cycle patterns of these species

This paper examines sex preferences for children in Vietnam using the mother birth cohort from 1972 to 1993. We specify the full set for sex-birth order composition of existing children using a split-population model. The model relaxes the assumption in conventional hazard models that all mothers would eventually have another child. Our results indicate a preference in these families for one male offspring. In addition, we observe a mixed sex preference at the fourth birth order. We also establish that a one-square-meter increase in household living area, as a proxy for the increment in household wealth, is associated with a 0.997 times lower preference for a son for the second childbirth, but a 1.015 and 1.014 times higher preference for a son for the third and fourth childbirths, respectively. As long as two-child families dominate the population structure, these results suggest that the importance placed on economic reasons for a son preference will gradually weaken as economic development proceeds in Vietnam. [ABSTRACT FROM AUTHOR]

Building on social role theory, we extend a contingency perspective on intergroup competition proposing that having groups compete against one another is stimulating to the creativity of groups composed largely or exclusively of men but detrimental to the creativity of groups composed largely or exclusively of women. We tested this idea in two separate studies: a laboratory experiment (Study 1) and a field study (Study 2). Study 1 showed that competition had the expected positive effects on the creativity of groups composed mostly or exclusively of men and produced the predicted negative effects on the creativity of groups composed of women, even though the latter effects emerged at the high end of the competition spectrum and for sex-homogeneous groups only. Results of Study 1 also revealed that within-group collaboration mediated the joint effects of competition and sex composition on group creativity. Study 2 replicated the results of Study 1 in a field setting involving research and development teams. We discuss the implications of these findings for theory and practice. [ABSTRACT FROM AUTHOR]

Highlights: [•] We analyzed data from the ECLS-K. [•] Classroom sex composition affects reading scores in first grade. [•] Socio-emotional skills are also related to classroom sex composition. [•] Classroom behavior partially explains the effects of classroom sex composition. [Copyright &y& Elsevier]

We describe sibling proactive and reactive aggression in middle and late adolescence. Participants were 8th ( n = 303, M = 13.74 years, SD = .59) and 12th ( n = 300, M = 17.73 years, SD = .56) grade adolescents who completed an in-school survey. Findings revealed that these adolescents were significantly more likely to engage in reactive than proactive aggression with their closest-aged sibling. However, 8th grade adolescents reported greater aggression toward their closest-aged sibling than did 12th grade adolescents. In addition, sex composition of the sibling dyad moderated the association between sibling relationship quality (i.e., warmth and rivalry) and both proactive and reactive aggression indicating unique links for brother-brother and older sister-younger brother pairs. [ABSTRACT FROM AUTHOR]

In India, many parents follow son-preferring fertility-stopping rules. Stopping rules affect both the number of children and the sex composition of these children. Parents whose first child is male will stop having children sooner than parents whose first child is female. On average, parents of a first-born son will have fewer children and will have a higher proportion of sons compared to parents of a first-born daughter. An economic model in which sons bring economic benefits and daughters bring economic costs, shows the importance of sex composition on child outcomes: holding the number of siblings constant, boys are better off with sisters and girls are better off with brothers. Empirical evidence using the sex outcome of first births as a natural experiment shows that stopping rules can exacerbate discrimination, causing as much as a quarter of excess female child mortality. Another implication of the research is that the use of sex-selective abortion may lower female mortality, but raise male mortality. [ABSTRACT FROM AUTHOR]

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This article examines desired family size and sex composition, the extent of son preference, the underlying motivations for the preference, and the knowledge and use of the new reproductive technologies to achieve these preferences in two culturally distinct but economically similar immigrant communities in New Delhi, India. The two groups - one group from Punjab, north India, and the other from Kerala, south India - are considered in the literature to be two extremes in the socio-cultural spectrum, particularly in terms of kinship organizations, gender relations, women's decision-making power, and levels of women's autonomy. The results of the study suggest that shared urban experience, acceptance of a small family norm, and easy accessibility of new reproductive technologies and abortion services have led to similarities in desired family size, preference for sons, and means taken to realize their preference in the two communities. The article concludes with a discussion of the intricate and intersecting views of parents on family size, son preference and daughter neglect, and the many ways of regulating family size and sex composition in urban India, and draws parallel with similar research findings in India and elsewhere in Asia. [ABSTRACT FROM AUTHOR]

Abstract: A multilevel modeling approach was employed to investigate the relation between sex composition and developmental change in 70 urban preschool classrooms. The research represents a unique contribution as (1) few studies have examined the influence of sex composition during the preschool years, (2) it represents the first research to use a continuous (i.e., sex ratio) as opposed to binary (i.e., mixed- versus single-sex) indicator for classroom sex composition, and (3) the sample represents an important and often neglected group (i.e., low-income children from urban schools). A series of HLM models were run, addressing the nested nature of the data (children within classrooms), and relating classroom sex composition to developmental change using the cognitive, motor, and social subscales from the Child Observation Record (COR). Overall, there were no main effects at the classroom-level for sex composition. However, a cross-level interaction indicated that, while girls’ development was not influenced by classroom sex composition, boys in classrooms with proportionally more boys fared significantly worse in terms of development as assessed by combined score on the COR. More specifically, this interaction was significant when predicting the COR cognitive subscale, but nonsignificant when predicting the COR social and motor subscales. This was true when controlling for the number of students at the classroom-level, as well as child''s age and baseline ability (i.e., Time 1 COR) at the child-level. Implications for early childhood education policy are discussed. [Copyright &y& Elsevier]

Abstract: This paper develops and estimates models of family and sex-specific emigration, as well as the sex composition of this emigration, from 12 European source countries to the U.S. for the period 1870–1910. The models are based on the distinction between economic migrants (males, single females, and some married females) and tied or trailing migrants (females) and are estimated with panel data, including data that relate to the occupational/industrial structure of male and female economic activity in source countries. Hausman-Taylor instrumental variable estimates suggest that although both males and females responded to labor-market signals, males were more responsive than females to per capita GDP differences. Moreover, compared to the rest of Europe, Ireland, and Scandinavia were the sources of many young, single male, and female migrants, who responded strongly to gaps in economic opportunities. In fact, much of the European response to such gaps appears to be due to migrants from Ireland and Scandinavia. Females tended to originate in English-speaking countries and countries that were agriculturally oriented. Service and manufacturing jobs in source countries discouraged the migration of females relative to males. Males tended to follow recent migrants more than females, but females responded more to long-term influences as measured by stocks of migrants from their source countries who had previously settled in the U.S. Countries with high birth rates had relatively fewer female emigrants, whereas those with high rates of natural increase 20 years earlier experienced relatively more male emigration. Intact families, other family members (including family-strategy male migrants and trailing female migrants), and single males and females responded strongly to economic incentives, but the singles were most responsive followed by family-strategy males. [Copyright &y& Elsevier]

Structured personal interviews were conducted with 105 senior and mid-level Chinese male and female managers, in which each respondent provided information about their career success network (CSN) ties. Using this data, we tested hypotheses on: (1) the age composition of Chinese managers' CSNs; (2) the face-to-face interaction practices within Chinese managers' CSNs; and (3) the roles of tie sex composition and tie content (position-centred versus person-centred ties) in influencing the age composition of and interaction practices within Chinese managers' CSNs. The results demonstrated that both Chinese male and female managers, while generally preferring to form CSN ties with individuals who are older than themselves, are relatively more reluctant to include middle-aged or elder women in their CSN. The age of those included in the respondents' CSN was also influenced by tie content and whether the tie spans the organizational boundary. With respect to interaction practices within the CSN, tie content moderated the relationship between tie sex composition and interaction practice. Female managers' person-centred ties with men had significantly lower levels of interaction outside the workplace than person-centred ties composed of members of the same-sex. However, this difference was not exhibited in the case of position-centred ties. Interestingly, the reluctance to socialize with the opposite-sex exhibited by female managers did not appear to be shared by their male counterparts. The implications of these results for career success in China are discussed. [ABSTRACT FROM AUTHOR]

Using historical data from the Utah Population Database, this analysis finds significant, consistent, but small adverse mortality effects for mothers after age 50 who had mostly sons. Examination of age-dependent effects indicates that this association increases with mother’s age. Additionally, mothers who had mostly daughters faced mortality risks that increased with age. Offspring sex composition did not have a significant effect on paternal mortality. Interaction analyses were conducted to examine the effect of offspring sex composition with regard to historical period, residential location, socioeconomic status, and childhood survival. No other interactions were found to be statistically significant. Having mostly boys remained detrimental to maternal mortality regardless of childhood survival. [ABSTRACT FROM AUTHOR]

Differences in the growth rate of male and female offspring can result in different parental rearing costs for sons and daughters. Such differences may also influence the survival chances of male and female offspring when conditions are unfavourable. In birds, hatching asynchrony leads to hierarchical competition for food between siblings. Therefore, the sex of the chick in the first hatched position in the brood may influence breeding success by affecting the extent to which the later hatched chicks can compete for resources. The interaction between brood sex composition and chick performance in the herring gull Larus argentatus was examined under different environmental conditions. When environmental conditions were relatively good, chick survival within broods was better when a female was first to hatch, an effect that was most obvious later in the season. When conditions were poorer however, sex of the first hatched chicks was not related to brood survival. In neither situation did the overall primary sex ratio differ from equality. However in the year of relatively good food availability, the first chick in the brood was more likely to be male early in the season, which was when the disadvantageous effects on brood survival of males being in this position are weakest. [ABSTRACT FROM AUTHOR]

Abstract: The objective of this study was to evaluate the effect of sex composition of the group of lambs before puberty on later sexual performance in Awassi ram lambs. Thirteen Awassi ram lambs of the same age were raised in either all-male group (n =7) or in a group mixed with females (n =6) from weaning to puberty. Blood samples, body weights (BW) and scrotal circumferences (SC) of ram lambs were recorded between eight and 10 months of age. Sexual performance testing was performed at 9 months of age by individually exposing ram lambs to oestrous females on five occasions. Body weight and SC were greater (P <0.01) in the all-male compared with the mixed group. Plasma testosterone concentrations were not influenced (P >0.05) by treatment. Plasma testosterone concentrations were significantly correlated (P ≤0.05) with BW (r =0.3) and SC (r =0.4). No treatment effects were detected regarding bouts of leg-kicking. Bouts of anogenital sniffing, the frequency of mount attempts and mounting frequency were greater (P <0.05) in the all-male group. Even though the frequency of raising the fat tail of females was similar between the two treatments, the mixed group tended to be (P =0.08) more efficient in doing so than the all-male group (higher tail raising/mount). Results of the current study indicate that mixing groups of ram and ewe lambs before puberty may be insufficient to improve later sexual performance of ram lambs. [Copyright &y& Elsevier]

This study examined the effects of sex and sex dissimilarity on the task and social experiences of members of ongoing teams of management students. We hypothesized that women would have lower levels of social exchange, and ultimately lower levels of attachment to their groups than would men, and that there would be no sex differences in task exchanges or task contributions. Sex dissimilarity between individuals and their teams was expected to impair individuals' experiences. As predicted- women had lower social exchanges than men. There were no sex differences in attachment Surprisingly women had higher task exchanges and made greater task contributions. Sex dissimilarity had no effect on the experiences of men or women. Overall, women seemed to do more work or better work, but receive less social support, than did men. [ABSTRACT FROM AUTHOR]