Table II.

Prevalence and correlates of heterosexual anal intercourse (HAI) at last sex and condom use among men and women, National HIV Behavioral Surveillance, Heterosexuals at increased risk for HIV infection, United States, 2013

	HAI at last sex among those who had HAI in the past year				Condomless HAI among those who had HAI at last sex
	N	n	%	aPR (95% CI)	n	%	aPR (95% CI)
Women	1414	470	33.2	N=1332a	438	93.2	N=463a
Last sex partner
Partner type
Main	741	199	26.9	Ref	182	91.5
Casual	234	73	31.2	0.95 (0.75–1.20)	69	94.5
Exchange	438	198	45.2	1.30 (1.08–1.57)	187	94.4
	χ2 = 16.09, p < 0.001				χ2 = 0.84, p = 0.66
Potentially discordant partnerb
Yes	974	372	38.2c	1.58 (1.26–1.97)	354	95.2	1.10 (1.02–1.19)
No	440	98	22.3	Ref	84	85.7	Ref
	χ2 = 15.23, p < 0.001				χ2 = 7.17, p = 0.007
Partner ever injected drugs
Yes	302	136	45.0	1.28 (1.03–1.61)	130	95.6
No	1051	311	29.6	Ref	286	92.0
	χ2 = 7.90, p = 0.005				χ2 = 2.25, p = 0.13
Partner ever had sex with a man
Yes	359	155	43.2		153	98.7	1.06 (1.02–1.11)
No	1054	314	29.8		284	90.5	Ref
	χ2 = 7.31, p = 0.007				χ2 = 12.37, p < 0.001
Last sex event
Respondent used alcohol/drugs before/during sex
Yes	780	285	36.5		265	93.0
No	634	185	29.2		173	93.5
	χ2 = 4.86, p = 0.03				χ2 = 0.10, p = 0.75
Men	1687	591	35.0	N=1593c	514	87.0	N=569a
Last sex partner
Partner type
Main	717	179	25.0	Ref	158	88.3	Ref
Casual	474	157	33.1	1.19 (0.99–1.44)	126	80.3	0.87 (0.78–0.96)
Exchange	496	255	51.4	1.62 (1.33–1.96)	230	90.2	0.92 (0.84–1.01)
	χ2 = 20.75, p < 0.001				χ2 = 5.31, p = 0.07
Potentially discordant partnerd
Yes	1207	472	39.1	1.28 (1.07–1.55)	430	91.1	1.21 (1.10–1.32)
No	480	119	24.8	Ref	84	70.6	Ref
	χ2 = 14.93, p < 0.001				χ2 = 10.19, p = 0.001
Partner ever injected drugs
Yes	366	181	49.5	1.25 (1.08–1.46)	173	95.6	1.11 (1.03–1.19)
No	1267	395	31.2	Ref	328	83.0	Ref
	χ2 = 11.27, p < 0.001				χ2 = 6.62, p = 0.01
Last sex event
Respondent used alcohol/drugs before/during sex
Yes	1116	414	37.1		374	90.3	1.11 (1.01–1.23)
No	569	177	31.1		140	79.1	Ref
	χ2 = 3.01, p = 0.08				χ2 = 6.06, p = 0.01

Note: aPR = adjusted prevalence ratio, CI = confidence interval, p-value based on type 3 global test of significance in bivariable GEE model that controlled for factors related to study design.

^amodel controlled for race/ethnicity and factors related to study design (city, recruiter's value for the outcome, network size) and clustered on recruitment chain

^bpotentially discordant partner = the respondent or partner is unaware of their HIV status or the partner is HIV-positive

^cmodel controlled for race, homelessness in the past year, annual household income and factors related to study design (city, recruiter's value for the outcome, network size, and clustered on recruitment chain