Contingency management to reduce methamphetamine use and sexual risk among men who have sex with men: a randomized controlled trial

Table 3 Effect of a contingency management intervention on reports of any non-concordant unprotected anal intercourse in the prior 6 weeks and the number of non-concordant unprotected anal intercourse partners in the prior 6 weeks

	Proportion reporting any non-concordant UAI, n (%)
Visit	Total	Contingency Management	Control	Unadjusted RR (95% CI)	Adjusted RR^a(95% CI)
Baseline	35/127 (28)	21/70 (30)	14/57 (25)
Week 6	18/92 (20)	9/48 (19)	9/44 (20)
Week 12	12/102 (12)	8/56 (14)	4/46 (9)	1.13 (0.54, 2.37)	0.80 (0.47, 1.35)
Week 18	9/99 (9)	3/53 (6)	6/46 (13)
Week 24	11/107 (10)	6/60 (10)	5/47 (11)	0.67 (0.24, 1.85)	0.51 (0.21, 1.25)
	Self-reported non-concordant UAI partners, mean (SD)
Visit	Total	Contingency Management	Control	Unadjusted Rate Ratio (95% CI)	Adjusted Rate Ratio^b (95% CI)
Baseline	1.35 (4.6)	1.70 (5.5)	0.90 (2.7)
Week 6	0.47 (1.5)	0.35 (0.9)	0.60 (1.9)
Week 12	0.19 (1.0)	0.09 (0.3)	0.30 (1.4)	0.46 (0.14, 1.52)	0.58 (0.17, 1.90)
Week 18	0.12 (0.4)	0.09 (0.4)	0.15 (0.4)
Week 24	0.11 (0.4)	0.10 (0.3)	0.13 (0.4)	0.70 (0.25, 1.95)	0.49 (0.18, 1.37)

CI, confidence interval; RR, relative risk; SD, standard deviation; UAI, unprotected anal intercourse.
^aAdjusted for HIV status, report of non-concordant UAI in the prior 6 weeks at baseline and use of other substances (inhaled nitrites, gamma-hydroxybutyrate, ecstasy, or erectile dysfunction medications) in the prior 6 weeks at baseline.
^bAdjusted for HIV status, number non-concordant UAI partners in the prior 6 weeks at baseline and use of other substances (inhaled nitrites, gamma-hydroxybutyrate, ecstasy, or erectile dysfunction medications) in the prior 6 weeks at baseline.

ISSN: 1471-2458