TABLE 3.

Partner gang membership and pregnancy incidence: mediation analysis results Mission Teen Health Project, San Francisco, CA 2001–2004

	Hazard Ratio†	95% CI	p-value	% Mediated Effect
Partner gang membership	1.90	1.09, 3.32	0.024
Partnership characteristics
Had a casual partner in the last 6 months	2.36	1.29, 4.32	0.005	17.4%
Number of partners with other partners	2.64	1.45, 4.83	0.002	26.9%
Had a partner in detention	1.77	0.96, 3.27	0.066	19.3%
If you asked your boy friend to use a condom, he would probably think you're having sex with someone else	2.00	1.08, 3.72	0.028	2.3%
Pregnancy intentions
Participant wants pregnancy, lagged 1 visit	1.99	0.99, 3.97	0.052	3.5%
Male partner wants pregnancy, lagged 1 visit	1.84	0.91, 3.70	0.088	14.3%
All mediators combined	2.18	1.02, 4.64	0.043	8.8%

^†Hazard ratios express the adjusted effects of gang exposure on pregnancy risk. Also included in each model were: study time, US vs. foreign born, mother's educational level, age, and crowded living conditions.