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Key Points: Question: Is having peers with a mental disorder in the same social network during adolescence associated with later risk of mental disorder? Findings: In this cohort study including more than 700 000 individuals in Finland, analysis of nationwide, interlinked registry data found that having classmates diagnosed with a mental disorder in the ninth grade of comprehensive school was associated with increased risk of receiving a mental disorder diagnosis later in life. Increased risk remained after adjusting for an array of parental, school-level, and area-level confounders. Meaning: The findings of this study suggest that mental disorders might be socially transmitted within adolescent peer networks. Importance: Previous research indicates that mental disorders may be transmitted from one individual to another within social networks. However, there is a lack of population-based epidemiologic evidence that pertains to the full range of mental disorders. Objective: To examine whether having classmates with a mental disorder diagnosis in the ninth grade of comprehensive school is associated with later risk of being diagnosed with a mental disorder. Design, Setting, and Participants: In a population-based registry study, data on all Finnish citizens born between January 1, 1985, and December 31, 1997, whose demographic, health, and school information were linked from nationwide registers were included. Cohort members were followed up from August 1 in the year they completed ninth grade (approximately aged 16 years) until a diagnosis of mental disorder, emigration, death, or December 31, 2019, whichever occurred first. Data analysis was performed from May 15, 2023, to February 8, 2024. Exposure: The exposure was 1 or more individuals diagnosed with a mental disorder in the same school class in the ninth grade. Main Outcomes and Measures: Being diagnosed with a mental disorder during follow-up. Results: Among the 713 809 cohort members (median age at the start of follow-up, 16.1 [IQR, 15.9-16.4] years; 50.4% were males), 47 433 had a mental disorder diagnosis by the ninth grade. Of the remaining 666 376 cohort members, 167 227 persons (25.1%) received a mental disorder diagnosis during follow-up (7.3 million person-years). A dose-response association was found, with no significant increase in later risk of 1 diagnosed classmate (HR, 1.01; 95% CI, 1.00-1.02), but a 5% increase with more than 1 diagnosed classmate (HR, 1.05; 95% CI, 1.04-1.06). The risk was not proportional over time but was highest during the first year of follow-up, showing a 9% increase for 1 diagnosed classmate (HR, 1.09; 95% CI, 1.04-1.14), and an 18% increase for more than 1 diagnosed classmate (HR, 1.18; 95% CI, 1.13-1.24). Of the examined mental disorders, the risk was greatest for mood, anxiety, and eating disorders. Increased risk was observed after adjusting for an array of parental, school-level, and area-level confounders. Conclusions and Relevance: The findings of this study suggest that mental disorders might be transmitted within adolescent peer networks. More research is required to elucidate the mechanisms underlying the possible transmission of mental disorders. This cohort study examines the transmission of mental disorders among adolescents observed in follow-up after school exposure to 1 or more classmates diagnosed with a mental disorder. [ABSTRACT FROM AUTHOR]

We use the Young Finns Study (N = ∼2000) on the measured height linked to register-based long-term labor market outcomes. The data contain six age cohorts (ages 3, 6, 9, 12, 15 and 18, in 1980) with the average age of 31.7, in 2001, and with the female share of 54.7. We find that taller people earn higher earnings according to the ordinary least squares (OLS) estimation. The OLS models show that 10 cm of extra height is associated with 13% higher earnings. We use Mendelian randomization, with the genetic score as an instrumental variable (IV) for height to account for potential confounders that are related to socioeconomic background, early life conditions and parental investments, which are otherwise very difficult to fully account for when using covariates in observational studies. The IV point estimate is much lower and not statistically significant, suggesting that the OLS estimation provides an upward biased estimate for the height premium. Our results show the potential value of using genetic information to gain new insights into the determinants of long-term labor market success. [ABSTRACT FROM AUTHOR]

This paper studies the impact of long-term unemployment on physical activity. We examined the effects 6 and 15 years following a severe business cycle downturn in Finland over the period 1991–1994. The study sample comprised residents of Northern Finland. The unemployed individuals were 23–26 years old during the downturn. Physical activity, measured by MET minutes and meeting WHO guidelines, was higher 15 years later among those people who experienced the longest periods of unemployment in 1991–1994. Physical activity was somewhat lower among people with relatively shorter periods of unemployment. • We study the effect of unemployment on long-term physical activity. • We use the Finnish Depression of the early 1990s as a source of an abrupt labor market shock. • The effect is varies in terms of the months spent unemployed during the recession. • Unemployment is generally not linked to increased physical activity. • The link is found for those with longest periods of unemployment during the recession. [ABSTRACT FROM AUTHOR]

Education and risky health behaviors are strongly negatively correlated. Education may affect health behaviors by enabling healthier choices through higher disposable income, increasing information about the harmful effects of risky health behaviors, or altering time preferences. Alternatively, the observed negative correlation may stem from reverse causality or unobserved confounders. Based on the data from the Cardiovascular Risk in Young Finns Study linked to register-based information on educational attainment and family background, this paper identifies the causal effect of education on risky health behaviors. To examine causal effects, we used a genetic score as an instrument for years of education. We found that individuals with higher education allocated more attention to healthy habits. In terms of health behaviors, highly educated people were less likely to smoke. Some model specifications also indicated that the highly educated consumed more fruit and vegetables, but the results were imprecise in this regard. No causal effect was found between education and abusive drinking. In brief, inference based on genetic instruments showed that higher education leads to better choices in some but not all dimensions of health behaviors. • Higher education is associated with better health behaviors. • Reverse causality or unobserved confounders may explain this correlation. • We use genetic instruments to identify the linkage between education and health behaviors. • We find that the highly educated smoke less and pay more attention to healthy habits. • No association was found between education and abusive drinking patterns. [ABSTRACT FROM AUTHOR]

Abstract: This paper examines the role of physical strength in the determination of the height wage premium by using the “Health 2000 in Finland” data that contain both self-reported information on the physical strenuousness of work, and information on muscle mass from medical examinations. The results suggest that there are generally no distinct differences in the height premium between four different work strain categories. We also find that muscle mass is positively associated with wages per se. The premium is both statistically and economically more significant for men than for women. In terms of occupational sorting, we observe that the shortest men do physically very demanding work and the tallest do sedentary work, even after controlling for the influences of age and education. [Copyright &y& Elsevier]

Abstract: This paper examines the relationship between obesity and labour market success in Finland, using various indicators of individual body composition along with body mass index (BMI). Weight, height, fat mass and waist circumference are measured by health professionals. We find that only waist circumference has a negative association with wages for women, whereas no obesity measure is significant in the linear wage models for men. However, all measures of obesity are negatively associated with women''s employment probability and fat mass is negatively associated with men''s employment probability. We also find that the use of categories for waist circumference and fat mass has a substantial influence on the results. For example, the category for high fat mass is associated with roughly 5.5% lower wages for men. All in all, the results indicate that in the absence of measures of body composition, there is a risk that labour market penalties associated with obesity are measured with bias. [Copyright &y& Elsevier]

BACKGROUND: Aggregate time-series evidence has shown that overall per capita alcohol consumption is associated with sickness absence. This study re-examines the relationship between alcohol consumption and sickness absence by using individual-level microdata and methods that yield results which are less likely to be due to spurious correlations. METHODS: Data on sickness absence and alcohol consumption for 18 Finnish regions over the period 1993-2005 was used. Sickness absence was measured as the number of sickness absence days during 1 year. Alcohol consumption was measured as the number of alcohol drinks consumed per week. The individual-level relationship between alcohol consumption and sickness absence was estimated by using Poisson regression models. Unobserved determinants of lifestyle behaviours associated with the region and survey year were controlled for. Personal characteristics as well as the clustering of observations by regions were also taken into account. RESULTS: The estimates show that alcohol consumption is associated with sickness absence. The positive relationship between alcohol consumption and sickness absence is particularly pronounced for low-educated males. CONCLUSIONS: Aggregate time-series evidence for the relationship between alcohol consumption and sickness absence is confirmed by using individual-level microdata. The policy lesson is that it is important to take into account the effects of alcohol consumption on the prevalence of sickness absence (i.e. labour supply on an intensive margin) when one is considering the level of taxation of alcoholic beverages. [ABSTRACT FROM AUTHOR]

We study the predictors of sickness absences among 2800 Finnish workers responding to the cross-sectional Quality of Work Life Survey in 1997. The data contain detailed information on the prevalence of adverse working conditions at the workplace from a representative sample of wage and salary earners. We show by using recursive multivariate models that the prevalence of harms at the workplace is associated with job dissatisfaction and dissatisfaction with sickness absences. The policy lesson is that the improvement of working conditions should be an integral part of any scheme aimed at decreasing sickness absence. [ABSTRACT FROM AUTHOR]

This paper examines the relationship between the physical strenuousness of work and the BMI in Finland, using individual microdata at 5-year intervals over the period 1972-2002. Data came from the National FINRISK Study which contains self-reported information on the physical strenuousness of a respondent's occupation. Our estimates show that the changes in the physical strenuousness of work explain around 7% at most of the increase in BMI for Finnish males observed over a period of 30 years. The main reason for this appears to be the effect of the physical strenuousness of work on BMI which is rather moderate. According to the point estimates, BMI is 2.4% lower when a male's occupation is physically very demanding and involves lifting and carrying heavy objects compared with a sedentary job (reference group of the estimations), other things being equal. Furthermore, it is very difficult to associate the changes in the occupational structure with the upward trend in BMI for females, and the contribution of the changes in the occupational structure is definitely even smaller for females than it is for males. All in all, we show that the changes in self-reported occupation show a slight association with the changes in the logarithm of the BMI scores. [ABSTRACT FROM AUTHOR]

This study explores the determination of average working time in the context of a Nordic welfare state. The study is focused on the Finnish case. The issue is explored by using data from six industries from 1960 to 1996. The main empirical result is that both an increase in labour productivity and a widening of the tax wedge have contributed to a decline in average working time in Finland. These observations are consistent with the predictions of a theoretical model that is based on the notion of equilibrium working hours. [ABSTRACT FROM AUTHOR]

• The study examines infection-related hospitalizations (IRHs) in childhood. • Having an additional IRH is associated with weaker labour market outcomes (LMO). • The links between IRHs and LMO are similar during early and later childhood. • The connection is partly mediated through education but not through adult health. • IRH prevention and/or educational support for children who suffer from IRH is needed. A burgeoning body of literature suggests that poor childhood health leads to adverse health outcomes, lower educational attainment and weaker labour market outcomes in adulthood. We focus on an important but under-researched topic, which is the role played by infection-related hospitalization (IRH) in childhood and its links to labour market outcomes later in life. The participants aged 24–30 years in 2001 N = 1706 were drawn from the Young Finns Study, which includes comprehensive registry data on IRHs in childhood at ages 0–18 years. These data are linked to longitudinal registry information on labour market outcomes (2001–2012) and parental background (1980). The estimations were performed using ordinary least squares (OLS). The results showed that having an additional IRH is associated with lower log earnings (b = -0.110, 95 % confidence interval (CI): −0.193; −0.026), fewer years of being employed (b = −0.018, 95 % CI: −0.031; −0.005), a higher probability of receiving any social income transfers (b = 0.012, 95 % CI: −0.002; 0.026) and larger social income transfers, conditional on receiving any (b = 0.085, 95 % CI: 0.025; 0.145). IRHs are negatively linked to human capital accumulation, which explains a considerable part of the observed associations between IRHs and labour market outcomes. We did not find support for the hypothesis that adult health mediates the link. [ABSTRACT FROM AUTHOR]