Table 2 presents the lifetime prevalence rates of DSM-IV mental disorders by sex, age group, total DSM-IV disorders and disorders with severe impairment. Mood disorders affected 14.3% of the total sample, corresponding to 11.7% who met criteria for MDD or dysthymia and 2.9% for BPD. Females were twice as likely to experience unipolar mood disorders as compared to males, and somewhat more likely to experience BPD. The prevalence of all mood disorders increased uniformly with age, with a nearly two-fold increase from the 13–14 year age group to the 17–18 year age group. Severe cases of mood disorder (11.2% of the total sample) represented 74.4% of all MDD or dysthymic disorders, and 89.7% of all cases of BPD. The sex-specific rates for severe disorders (not presented in the table) maintained the same general patterns as were observed for the overall prevalence rates.
