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Background: There is a lack of evidence of the complicated pathways of underlying determinants in the phases of physical activity. The purpose of this study was to evaluate simultaneously a set of potential determinants on the initiation and maintenance phases of leisure-time physical activity (LTPA). Methods: The longitudinal data of 54,359 Korean adults aged 40–69 years from the Health Examinees study were used. The median follow-up duration was 4.2 years. The self-reported durations per week of LTPA was repeatedly assessed. Based on previous longitudinal studies, the potential determinants were selected, and hypothetical models were constructed that consider the complex associations between the determinants. The standardized coefficients for direct and indirect effects were estimated using path analysis to differentiate contributions of mediation from the total effects. Results: In the total population, age, education, chronic diseases, smoking, depression symptoms, and self-rated health were significantly associated with both initiation and maintenance phases. Income (B = 0.025) and social supports (B = 0.019) were associated only with the initiation phase. Waist-to-hip ratio (B = −0.042) and stress (B = −0.035) were associated only with the maintenance phase. After stratifying by sex, the significant effects of education, chronic diseases, and smoking were found only in men. The initiation phase-specific effects of income and social supports and the maintenance phase-specific effects of stress were found only in women. It was estimated that indirect effects contributed approximately 15% of the total effect. Conclusion: The findings suggested that there were initiation- or maintenance-specific determinants of leisure-time physical activity according to sex.

(1) Background: This study explored changes before and during the COVID-19 pandemic in terms of developmental outcomes among kinship foster care children in the Republic of Korea: and gender differences in the changes; (2) Methods: The study analyzed the data of 217 kinship care children who participated in both the first- and second-wave surveys of the Panel Study of Korean Foster Care Children. As the main statistical methods, we utilized repeated-measures ANOVA and analysis of covariance (ANCOVA); (3) Results: Analysis of developmental outcomes measured before and during the pandemic showed no significant changes. However, significant interaction effects existed between time (before and during the pandemic) and gender, indicating that boys and girls recorded different patterns of change before and during the COVID-19 pandemic; (4) Discussion:During the COVID-19 pandemic, girls experienced negative changes in most areas of development, whereas boys experienced positive changes. The policy and practical implications for foster care children in Korea were discussed.

Rationale: Exposure to fine particulate matter has adverse effects on mental health outcomes. However, no empirical study has yet been conducted on mechanisms of how and why exposure to fine particulate matter can affect mental health outcomes, especially focusing on children. In addition, children living in poverty may be more vulnerable to fine particulate matter. Objective: This study aims to examine whether physical activity can explain the impact of ambient fine particulate matter on depressive symptoms among Korean children and whether family poverty moderates the associations between fine particulate matter, physical activity, and children’s depressive symptoms. Methods: Children and their primary caregiver data were drawn from the Children’s Happiness Life Time Survey data collected by Child Fund Korea, and fine particulate matter data were derived from Air Korea, collected by the Korea Environment Corporation. Individual-level data were linked to a nationwide neighborhood-level data on air quality. Multilevel structural equation modeling was used to consider the hierarchical data structure. The analytical sample consisted of 4,161 children living in 79 neighborhoods. Results: The findings suggest that living in neighborhoods with higher levels of fine particulate matter is associated with a decrease in physical activity, which in turn increases children’s depressive symptoms. Physical activity fully mediates the association between fine particulate matter and children’s depressive symptoms. However, family poverty does not have a significant moderating role for the associations between fine particulate matter, physical activity, and children’s depressive symptoms. Conclusions: The results of this study indicate the importance of physical activity in relation to fine particulate matter and children’s depressive symptoms.

A study examined the effects of parent involvement and expectations on academic achievement among 567 Black and White middle school students in 18 Seattle (Washington) schools. Parent and teacher surveys indicated that parental involvement was the highest contributor to academic achievement among White students, whereas earlier educational achievement was the highest contributor among Black students. (Contains 50 references.) (TD)

Objective: This study aimed to investigate whether maternal negative affectivity (MNA) moderates the effect of genetic polymorphism of SLC6A4 on behavior problems in children. Methods: Study participants comprised 143 preschoolers and their mothers from South Korea. The Childhood Behavior Checklist and Emotionality, Activity, and Sociability adult scale were used to measure child behavior and maternal affectivity. DNA from saliva was genotyped to determine serotonin transporter polymorphism. Results: MNA appeared to exert effects in externalizing (b =5.78, p<0.001) and internalizing problems (b =6.09, p< 0.001). Interaction between SLCA4 polymorphism and MNA showed effects on externalizing (b =-7.62, p<0.01) and internalizing problems (b =-9.77, p<0.01). Children with two short alleles showed considerable differences in both externalizing and internalizing problems according to MNA; however, children with one short allele or none showed relatively few differences in behavior problems due to maternal affectivity. Conclusion: The effect of SLC6A4 polymorphism on child behavior seemed to be moderated by MNA. In addition, the impact of MNA was found to vary based on a child's genetic risk. High MNA may trigger the risk allele while low MNA causes the risk allele to illicit less behavior problems. Children with two short variants of the SLC6A4 gene may benefit from intervention that modulates MNA. [ABSTRACT FROM AUTHOR]

This paper presents a framework that integrates and extends the literature on psychosocial mechanisms mediating poverty and the development of antisocial behavior. It provides a model to explain why some poor children outgrow early antisocial behavior, while others from the same environment adopt increasingly severe antisocial behaviors. The ability to differentiate these effects of poverty on antisocial or prosocial behavior provides theoretical guidelines for preventive intervention. [ABSTRACT FROM AUTHOR]

In this study, we examined the violent death bereavement trajectories of 173 parents by following them prospectively for 5 years after their children's deaths by accident, suicide, homicide, or undetermined causes. Using latent growth curve methodology, we examined how the initial level of PTSD and the rate of change over time were influenced by 9 predictors: the deceased children's causes of death, parents' gender, self-esteem, 3 coping strategies, perceived social support, concurrent levels of mental distress, and an intervention offered in early bereavement. Six of the nine factors predicted initial levels of PTSD; however, only parents' gender and perceived social support predicted change in PTSD over the 5-year time frame. Five years postdeath, 3 times as many study mothers (27.7%) met diagnostic criteria for PTSD and twice as many study fathers (12.5%) met diagnostic criteria for PTSD compared with the normative samples. [ABSTRACT FROM AUTHOR]

Using data from the Seattle Social Development Project, we identify childhood predictors of offending trajectories among poor children. Five trajectories are identified: nonoffenders, late onsetters, desisters, escalators, and chronic offenders. Among initial nonoffenders, late onsetters are distinguished from nonoffenders by early alcohol drinking. Among youths already delinquent at age 13, escalators are distinguished from desisters by poor family management, family conflict, association with antisocial peers, the presence of troubled children in their neighborhoods, and drug availability. In contrast to prior findings for a general urban sample, family factors significantly predict desistance from offending by age 18 in children from low-income families. [ABSTRACT FROM AUTHOR]