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Abstract Background External causes of death, such as accidents, substance use, and suicide, contribute substantially to mortality during adolescence and early adulthood and show marked sex differences. Individuals born preterm are at increased risk of mental disorders, and impaired cognitive and executive functions, potentially increasing their vulnerability to death from external causes. We investigated sex-specific associations between gestational age at birth and mortality from external causes during late adolescence and early adulthood. Methods Individual level data from national health registries in Denmark (1978–2001), Finland (1987–2003), Norway (1967–2002), and Sweden (1974–2001) were linked to form nationwide cohorts. In total, 6,924,697 participants were followed from age 15 years to a maximum of 50 years in 2016–2018. Gestational age was categorized as “very/moderately preterm” (23–33 weeks), “late preterm” (34–36 weeks), “early term” (37–38 weeks), “full term” (39–41 weeks), and “post term” (42–44 weeks). Outcomes were mortality from external causes overall and from the largest subgroups transport accidents, suicide, and drugs or alcohol. We estimated sex-specific hazard ratios (HRs), with full term as the reference, and pooled each country’s estimates in meta-analyses. Results Across gestational ages mortality was higher for males than females. Individuals born very/moderately preterm had higher mortality from external causes, with HRs 1.11 (95% confidence interval [CI] 0.99–1.24) for males and 1.55 (95% CI 1.28–1.88) for females. Corresponding estimates for late preterm born were 1.11 (95% CI 1.04–1.18) and 1.15 (95% CI 1.02–1.29), respectively. Those born very/moderately preterm had higher mortality from transport accidents, but precision was low. For females, suicide mortality was higher following very/moderately preterm birth (HR 1.76, 95% CI 1.34–2.32), but not for males. Mortality from drugs or alcohol was higher in very/moderately and late preterm born males (HRs 1.23 [95% CI 0.99–1.53] and 1.29 [95% CI 1.16–1.45], respectively) and females (HRs 1.53 [95% CI 0.97–2.41] and 1.35 [95% CI 1.07–1.71], respectively, with some heterogeneity across countries). Conclusions Mortality from external causes overall was higher in preterm than full term born among both males and females. A clear sex difference was seen for suicide, where preterm birth was a risk factor in females, but not in males.

Abstract Background Attention deficit hyperactivity disorder (ADHD) begins in childhood and in many cases persists into adulthood. The transition from adolescence to adulthood for young people with ADHD is a vulnerable time and can be associated with comorbid conditions and unfavorable outcomes. Thus, further studies are needed to explore the characteristics of the transition period in emerging adulthood. The overall aim of this study was to gain increased knowledge of emerging adults’ experience of living with ADHD in the transition from adolescence to adulthood. This is a follow-up from a previous qualitative study that examined how young people experience receiving and living with a diagnosis of ADHD. Method The study has a qualitative retrospective design. Seven participants were included in this study using a purposive sampling method. We re-invited the same participants who were interviewed in 2015–2016 and conducted in-depth interviews. The data were subjected to Malterud’s systematic text condensation (STC). Results Four crosscutting themes were identified from our analysis: (1) low level of knowledge about ADHD and treatment options; (2) barriers to seeking and accessing help; (3) developing self-help strategies; and (4) a preference to discontinued medication use. Conclusion The participants emphasized a need for more information about ADHD in transition phases and support, both from professionals and peers, about finding ways to live meaningful lives. The treatment they had been offered was particularly linked to symptom reduction and medication use. A more appropriate focus would have been linked to how they, as citizens, could gain knowledge and skills to live meaningful lives with ADHD.