Table 2.

Relation between psychiatric comorbidity and sexual behaviour outcomes at age 21 in birth cohort. Figures are adjusted risk ratios^* (95% confidence intervals). All comparisons are between psychiatric comorbid groups named versus those with no disorder in sample. Base rates of comorbid cases within mania and schizophrenia spectrum groups were too low for reliable analyses

DSM-III-R diagnostic comorbid comparison group at age 21 (No of participants)	Risky sexual intercourse in past year	Lifetime history of sexually transmitted diseases	Sexual intercourse before age 16 years
Depressive disorders + substance disorders (n=50)	3.7 (2.6 to 5.4)†	2.5 (1.4 to 4.6)†	1.6 (1.1 to 2.4)†
Depressive disorders + antisocial disorders (n=17)	3.7 (2.1 to 6.4)†	4.5 (1.9 to 10.7)†	2.6 (1.6 to 4.2)†
Substance disorders + antisocial disorders (n=32)	3.6 (2.3 to 5.6)†	4.1 (1.9 to 8.5)†	2.8 (2.0 to 3.9)†

DSM-III-R=Diagnostic and Statistical Manual of Mental Disorders, third edition, revised. 

^*Risk ratios were adjusted to take account of sex differences in prevalence of disorder or sex variables. 

^†P<0.05.