Background Methods: Through linkage between several national registers, containing personal information from birth into adult age, we established a longitudinal, population-based cohort. Study participants were all 158 026 male singletons born in Norway in 1967–1971 as registered by the Medical Birth Registry of Norway who were national residents at age 29. Study outcome was unemployment defined as a lack of personal income among persons who were not under education in the calendar year of their 29th birthday. We computed unemployment risk in separate strata, and adjusted risk ratios and population attributable risks as measures of association and impact, respectively. Results Conclusion Introduksjon
