. Author manuscript; available in PMC: 2017 Mar 1.

Published in final edited form as: AIDS Behav. 2016 Mar;20(3):667–678. doi: 10.1007/s10461-015-1148-1

Table 2.

Comparing relationship characteristic differences in HIV-negative gay male couples who did not use substances with sex within the relationship to those with one or both partners who did

	Alcohol		Amyl nitrates		EDM ^a	Party drugs ^b

Sample size: dyads	By one partner N=16	By both partners N=56	By one partner N=9	By both partners N=16	By one partner N=14	By both partners N=9

Between couple- level characteristic	RRR (95% CI)	RRR (95% CI)	RRR (95% CI)	RRR (95% CI)	RRR (95% CI)	RRR (95% CI)
Investment model
Commitment level					9.03 (1.11 − 73.37)^*
Relationship satisfaction			5.03 (1.16 − 21.68)^*			7.40 (1.68 − 32.66)^**
Quality of alternatives			0.27 (0.10 − 0.75)^*		0.19 (0.05 − 0.67)^**
Trust scale
Predictability	5.47 (1.22 − 24.61)^*		0.33 (0.14 − 0.80)^*	0.48 (0.24 − 0.95)^*
Dependability		5.67 (1.64 − 19.62)^**
Faith	0.04 (0.01 − 0.36)^**	0.09 (0.02 − 0.46)^**
Communication patterns scale
Mutual constructive					2.74 (1.22 − 6.16)^*
Mutual avoidance					1.95 (1.02 − 3.72)^*

Notes.

Findings were produced from couple-level multinomial logistic regression which controlled for relationship length and only included couples who had one or both partners that had sex outside the relationship

P < 0.05,

^**

P < 0.01

EDM denotes Erectile Dysfunction Medication

Represents ecstasy, ketamine, GHB, cocaine, and methamphetamine