Building knowledge of adolescent mental health in the Nordic countries

Adolescence is an important developmental period. Young people face many pressures and challenges, including growing academic expectations, changing social relationships with family and peers, and the physical and emotional changes associated with maturation. Mental health is a broad concept, including positive mental health, mental health problems and psychiatric diseases. This introductory paper addresses the issue of positive mental health, and how existing data from the Health Behaviour in School-aged Children study (HBSC) may be used to deepen our knowledge of developments in mental health among adolescents in the Nordic countries.   The Health Behaviour in School-Aged Children study is a WHO collaborative cross-national study that now includes 48 countries, collecting data every four years from 1984 to 2018 on health, well-being, health behaviour and social environments. Data collection is carried out in school classes via self-completion of questionnaires. An asset of the study is that the HBSC focuses on understanding young people’s health in their social context at family, peer, school, neighbourhood, and country levels. The investment in the HBSC study gives unique opportunities for high-quality research and monitoring in the Nordic countries.   The on-going Nordic research collaboration on positive mental health among adolescents uses the HBSC study as the research infrastructure for analysing trends as well as collecting new data on positive mental health. This special issue reports on trends when positive perspectives have been guiding the analysis of available data. The present research explores the potential of Nordic collaboration and comparative studies of school-aged children in the Nordic countries.</p

Differential item functioning in the Danish translation of the SF-36

Statistical analyses of Differential Item Functioning (DIF) can be used for rigorous translation evaluations. DIF techniques test whether each item functions in the same way, irrespective of the country, language, or culture of the respondents. For a given level of health, the score on any item should be independent of nationality. This requirement can be tested through contingency-table methods, which are efficient for analyzing all types of items. We investigated DIF in the Danish translation of the SF-36 Health Survey, using two general population samples (USA, n = 1,506; Denmark, n = 3,950). DIF was identified for 12 out of 35 items. These results agreed with independent ratings of translation quality, but the statistical techniques were more sensitive. When included in scales, the items exhibiting DIF had only a little impact on conclusions about cross-national differences in health in the general population. However, if used as single items, the DIF items could seriously bias results from cross-national comparisons. Also, the DIF items might have larger impact on cross-national comparison of groups with poorer health status. We conclude that analysis of DIF is useful for evaluating questionnaire translations