Adolescents were about twice as likely to make a suicide attempt over the course of the year if they had at least one biological parent with a history of a mental health problem (the stratified Kaplan–Meier estimates of cumulative incidence over follow-up were significantly different for the two parental history groups, p = .002). The 1-year cumulative incidence of suicide attempts was estimated to be 0.23 (95% CI: 0.17–0.30) for adolescents with at least one biological parent with a history of mental health problems, and 0.10 (95% CI: 0.06–0.16) for adolescents without such an affected parent (Table 2). While the cumulative incidence of suicide attempt was higher for those adolescents that entered the study having made multiple previous attempts (trend), there was a consistent increase in the cumulative incidence of attempts observed during the study among those with a parent with a mental health problem, regardless of previous attempt history (Fig. 1).
