Table 3.

Association between substance used (stimulant versus alcohol) and 1) increase in number of partners, 2) not needing to worry about condomless sex with HIV infected partners, and 3) having more condomless sex following initiation of PrEP

	Number of Partners Would Increase Following PrEP				Do Not Need to Worry About Condomless Sex with HIV Infected Partners Following PrEP Use				Would Have More Condomless Sex After Initiating PrEP
	Bivariate1 RR (95% CI)	P	Multivariable1 aRR (95% CI)	P	Bivariate1 RR (95% CI)		Multivariable1 aRR (95% CI)		Bivariate1 RR (95% CI)	P	Multivariable1 aRR (95% CI)	P
Stimulant use (vs. alcohol)	1.57 (0.96 to 2.58)	0.07	1.31 (0.52, 3.28)	0.57	2.52 (1.32 to 4.81)	0.005	2.62 (1.04, 6.60)	0.04	1.39 (0.94 to 2.05)	0.10	1.83 (1.10 to 3.07)	0.02
Age (years)			1.00 (0.98, 1.03)	0.70			0.99 (0.96, 1.02)	0.51			1.01 (0.99, 1.03)	0.23
Sexual identity
Homosexual/gay			Ref				Ref	Ref			Ref	Ref
Bisexual			1.34 (0.74, 2.41)	0.33			1.32 (0.72, 2.41)	0.37			1.42 (0.91, 2.22)	0.12
Heterosexual/straight			NA	NA			NA	NA			NA	NA
Other			1.14 (0.24, 5.51)	0.87			NA	NA			1.05 (0.38, 2.89)	0.92
Race/ethnicity
White			Ref	Ref			Ref	Ref			Ref	Ref
Black			1.18 (0.57, 2.44)	0.66			0.84 (0.35, 2.06)	0.71			0.86 (0.47, 1.60)	0.64
Asian			2.89 (0.90, 9.31)	0.08			2.50 (0.36, 17.6)	0.36			0.73 (0.10, 5.23)	0.76
American Indian			1.82 (0.68, 4.81)	0.23			2.45 (0.77, 7.83)	0.13			1.86 (0.87, 3.96)	0.11
Latino			1.51 (0.77, 2.95)	0.23			1.18 (0.57, 2.44)	0.65			0.85 (0.47, 1.54)	0.60
Unstable housing in past 3 months			1.28 (0.62, 2.64)	0.50			0.94 (0.44, 2.01)	0.87			0.93 (0.55, 1.57)	0.24
College degree or higher			0.96 (0.53, 1.72)	0.88			1.83 (0.93, 3.58)	0.08			1.31 (0.84, 2.03)	0.24
Relationship status
Single			Ref	Ref			Ref	Ref			Ref	Ref
Monogamous			1.27 (0.71, 2.27)	0.43			1.33 (0.70, 2.54)	0.39			1.09 (0.68, 1.75)	0.73
Non-monogamous			1.41 (0.67, 2.96)	0.36			0.91 (0.32, 2.55)	0.86			1.28 (0.75, 2.17)	0.37
Annual income
<$12,000			Ref	Ref			Ref	Ref			Ref	Ref
$12,000 to 23,999			1.53 (0.86, 2.73)	0.15			1.86 (0.85, 4.07)	0.12			0.70 (0.37, 1.32)	0.27
$24,000 to 59,999			0.84 (0.41, 1.71)	0.63			0.98 (0.38, 2.51)	0.97			0.70 (0.41, 1.21)	0.20
$60,000 or more			1.62 (0.71, 3.67)	0.25			1.27 (0.46, 3.52)	0.65			1.38 (0.76, 2.49)	0.29
Any health insurance			2.16 (1.03, 4.55)	0.04			2.39 (1.18, 4.82)	0.02			1.29 (0.68, 2.47)	0.44
Field recruitment			0.75 (0.31, 1.86)	0.54			0.72 (0.32, 1.61)	0.42			1.74 (1.04, 2.92)	0.04

Abbreviations: RR, risk ratio; aRR, adjusted risk ratio; CI confidence interval;

¹Modified Poisson generalized linear model with a robust error variance