The results increase our knowledge about the prevalence of CE-drug use and our understanding of what motivates and inhibits the use of CE-drug.

The German twin family study 'TwinLife' was designed to enhance our understanding of the development of social inequalities over the life course. The interdisciplinary project investigates mechanisms of social inequalities across the lifespan by taking into account psychological as well as social mechanisms, and their genetic origin as well as the interaction and covariation between these factors. Main characteristics of the study are: (1) a multidimensional perspective on social inequalities, (2) the assessment of developmental trajectories in childhood, adolescence, and young adulthood in a longitudinal design by using (3) a combination of a multi-cohort cross-sequential and an extended twin family design, while (4) capturing a large variation of behavioral and environmental factors in a representative sample of about 4,000 German twin families. In the present article, we first introduce the theoretical and empirical background of the TwinLife study, and second, describe the design, content, and implementation of TwinLife. Since the data will be made available as scientific use file, we also illustrate research possibilities provided by this project to the scientific community.

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Purpose The purpose of this paper is to examine whether and how employed single-parents differ from parents in two-parent families in their experience of work-to-family conflict (WFC) and family-to-work conflict (FWC). Looking at job-related as well as family-related demands and resources, this research investigated to what degree these demands and resources contribute to differences in WFC and FWC, how their relevance in predicting conflicts varies between single parents and other parents and the role of compositional differences in work and family demands and resources. Design/methodology/approach Cross-sectional linear regression analyses were applied to analyze a random sample of employees in large work organizations in Germany. The sample included 3,581 parents with children up to the age of 25, of whom 346 were single parents. Findings The results indicated that single parents face more FWC, but not more WFC, than other parents. For all parents, job demands such as overtime, supervising responsibilities and availability expectations were associated with higher levels of WFC, whereas job resources such as job autonomy, support from supervisors and flexible working hours were associated with lower levels of WFC. In predicting FWC, family demands and resources played only a minor role. However, results provide only scant evidence of differences between single parents and other parents in terms of the effects of job and family demands and resources. Originality/value This study offers interesting insights into the diversity of WFC and FWC experiences in Germany. It provides first evidence of the impact of job and family demands and resources on both directions of work–family conflicts among employed single parents as a specific social group.

Educational attainment in adolescence is of paramount importance for attaining higher education and for shaping subsequent life chances. Sociological accounts focus on the role of differences in socioeconomic resources in intergenerational reproduction of educational inequalities. These often disregard the intergenerational transmission of cognitive ability and the importance of children's cognitive ability to educational attainment. Psychological perspectives stress the importance of cognitive ability for educational attainment but underemphasize potentially different roles of specific socioeconomic resources in shaping educational outcomes, as well as individual differences in cognitive ability. By integrating two strands of research, a clearer picture of the pathways linking the family of origin, cognitive ability, and early educational outcomes can be reached. Using the population-based TwinLife study in Germany, we investigated multidimensional pathways linking parental socioeconomic position to their children's cognitive ability and academic track attendance in the secondary school. The sample included twins (N = 4008), respectively ages 11 and 17, and siblings (N = 801). We observed strong genetic influences on cognitive ability, whereas shared environmental influences were much more important for academic tracking. In multilevel analyses, separate dimensions of socioeconomic resources influenced child cognitive ability, controlling parental cognitive ability. Controlling adolescent cognitive ability and parental cognitive ability, parental socioeconomic resources also directly affected track attendance. This indicated that it is crucial to investigate the intertwined influences on educational outcomes in adolescence of both cognitive ability and the characteristics of the family of origin.