Fig. 3

Adjusted hazard ratios (HRs) of external causes of death according to country, sex, and gestational age at birth. Adjusted for age, birth year, birth order, maternal age, and highest parental education at birth. For Swedish data, maternal education at birth was used as paternal education was not available. HRs (squares or diamonds) with 95% confidence intervals (error bands). HRs for gestational age and sex categories with < 5 deaths are not shown. For confidence intervals expanding the range 0.44–4.0, the full interval is not shown, as indicated by arrows. All estimates can be found in Additional file 1: Tables S2–S5. Note that the y-scales are logarithmic