Table 5.

Generalized estimating equation models^a predicting any unprotected sex, unprotected sex with main partners, and unprotected sex with casual partners on days when sexually active

Predictor	Any unprt. sexb OR (95% CI)	Unprt. w/ mainc OR (95% CI)	Unprt. w/ casuald OR (95% CI)
Years age	1.05†	1.05	1.09†
	(1.02–1.08)	(0.99–1.10)	(1.04–1.14)
Ethnicity,	0.83	1.72	0.89
white = 1	(0.39–1.80)	(0.43–6.90)	(0.40–1.99)
Frequency of cocaine use	1.00	1.01	1.00
last 90 days	(0.99–1.01)	(0.99–1.03)	(0.99–1.02)
Partner alcohol problem,	1.65	2.14	0.62
yes = 1	(0.68–4.03)	(0.26–18.00)	(0.24–1.58)
Sex work,	0.23†	1.18	0.37*
yes = 1	(0.12–0.43)	(0.27–5.11)	(0.15–0.94)
Any alcohol use,	0.86	0.82	1.19
yes = 1	(0.51–1.44)	(0.32–2.08)	(0.79–1.79)

Notes: Unprt. = unprotected; OR = odds ratio; CI = confidence interval.

^aThe specified working correlation structure was autoregressive lag 1; coefficients give the population averaged estimated effects on the odds of having sex on the observed day; any alcohol use is a time-varying covariate assessed using Timeline Followback methodology; all other predictors are time-invariant covariates assessed at baseline; confidence interval estimates and tests of significance are based on the sandwich (robust) standard errors;

^b n = 242 participants sexually active on 9,334 person-days;

^c n = 216 participants sexually active with a main partner on 7,731 person-days;

^d n = 101 participants sexually active with a casual partner on 2,218 person-days.

^* p < .05;

^† p < .01.