Table 3

Subgroup prevalence estimates for undiagnosed rectal bSTI infection at study entry (N=3279)

Factors/test statistic	Overall		Black		Latino		White		Multiracial		Other identification
	N=3279		n=384		n=622		n=1679		n=396		n=198
	n	%	n	%	n	%	n	%	n	%	n	%
Age group (years)			G² (3)=10.50, p=0.02		G² (3)=10.35, p=0.02		G² (3)=18.15, p<0.001		G² (3)=4.83, p=0.19		G² (3)=3.53, p=0.32
16–24	139	16.5	18	17.5	36	18.3	53	14.8	21	16.9	11	18.3
25–34	155	11.7	16	8.7	29	10.8	67	11.2	32	17.5	11	11.7
35–49	49	6.7	3	3.9	9	7.0	24	5.9	10	12.8	3	7.1
50+	32	8.5	1	4.5	3	11.1	28	8.9	0	0.0	0	0.0
Region			G² (3)=1.60, p=0.66		G² (3)=2.31, p=0.51		G² (3)=9.69, p=0.02		G² (3)=3.32, p=0.35		G² (3)=0.03, p=1.00
Northeast	44	8.1	4	6.3	9	10.5	18	5.9	9	15.5	4	12.9
Midwest	66	11.3	7	10.6	4	7.0	39	10.3	12	23.1	4	12.5
South	152	12.8	22	11.2	27	12.8	74	12.3	22	17.3	7	13.2
West	108	11.6	5	8.6	33	13.4	41	10.4	19	12.6	10	12.2
Puerto Rico	5	16.1	--	--	--	--	--	--	--	--	--	--
Military overseas	0	0.0	--	--	--	--	--	--	--	--	--	--
College degree			G² (1)=0.79, p=0.37		G² (1)=4.14, p=0.04		G² (1)=2.99, p=0.08		G² (1)=2.15, p=0.14		G² (1)=0.24, p=0.62
No	239	13.0	27	10.9	57	14.4	98	11.5	45	17.9	12	14.0
Yes	136	9.4	11	8.1	20	8.9	74	8.9	18	12.4	13	11.6
Insurance status			G² (2)=0.75, p=0.69		G² (2)=3.39, p=0.18		G² (2)=7.92, p=0.02		G² (2)=1.94, p=0.38		G² (2)=4.52, p=0.10
None	99	15.2	9	9.4	24	14.2	40	15.2	20	20.2	6	26.1
Private	223	10.3	25	10.8	37	10.4	115	9.5	32	14.0	14	9.7
Public	53	11.6	4	7.1	16	16.7	17	8.3	11	16.2	5	16.1
Sexual identity			G² (1)=0.33, p=0.57		G² (1)=0.02, p=0.88		G² (1)=2.67, p=0.10		G² (1)=0.79, p=0.37		G² (1)=0.16, p=0.69
Gay	317	11.7	31	10.4	65	12.5	151	10.8	48	15.3	22	13.1
Queer	9	10.0	--	--	--	--	--	--	--	--	--	--
Bisexual	49	10.1	6	8.2	11	12.0	18	7.4	12	20.0	2	10.0
Relationship status			G² (1)=0.81, p=0.37		G² (1)=0.09, p=0.76		G² (1)=9.32, p=0.002		G² (1)=0.12, p=0.73		G² (1)=0.001, p=0.97
Single	283	12.1	28	9.2	55	12.6	137	11.7	45	15.5	18	12.7
Partnered	92	9.9	10	12.7	22	11.8	35	6.9	18	17.0	7	12.5
Major metro area			G² (1)=1.53, p=0.22		G² (1)=6.04, p=0.01		G² (1)=0.02, p=0.90		G² (1)=0.21, p=0.65		G² (1)=0.35, p=0.55
No	138	11.8	7	6.9	36	17.0	65	10.4	21	14.8	9	11.0
Yes	237	11.2	31	11.0	41	10.0	107	10.2	42	16.5	16	13.8
Most recent HIV test			G² (3)=4.17, p=0.24		G² (3)=0.95, p=0.81		G² (3)=3.13, p=0.37		G² (3)=15.09, p=0.002		G² (3)=4.95, p=0.18
In last 6 months	232	11.0	23	8.7	50	13.0	115	10.8	29	11.6	15	10.4
last 6–12 months	52	10.1	9	16.1	9	9.5	22	7.7	7	13.7	5	17.2
More than 1 year ago	63	13.0	3	6.4	14	13.0	28	11.4	17	24.6	1	7.7
Never	28	16.3	3	17.6	4	12.1	7	8.3	10	38.5	4	33.3
Sexual position			G² (2)=11.98, p=0.003		G² (2)=7.90, p=0.02		G² (2)=40.38, p<0.001		G² (2)=2.51, p=0.29		G² (2)=2.64, p=0.27
Top	18	3.4	2	2.3	3	3.8	5	1.8	6	10.3	2	8.3
Versatile	279	12.4	27	10.8	58	13.2	130	11.2	49	17.7	15	11.1
Bottom	78	16.0	9	19.1	16	15.1	37	15.7	8	13.1	8	20.5
PrEP status			G² (2)=1.54, p=0.46		G² (2)=0.32, p=0.85		G² (2)=5.42, p=0.07		G² (2)=0.25, p=0.88		G² (2)=0.09, p=0.96
Never	319	11.7	32	10.5	64	12.4	152	10.8	50	15.6	21	12.4
Former	28	9.0	2	4.9	8	14.0	8	5.2	8	18.6	2	12.5
Current	28	11.5	4	10.8	5	10.4	12	10.6	5	15.6	2	15.4
History of incarceration			G² (1)=2.46, p=0.12		G² (1)=1.21, p=0.27		G² (1)=0.26, p=0.61		G² (1)=3.00, p=0.08		G² (1)=0.46, p=0.50
No	338	11.4	36	10.7	72	12.8	155	10.1	52	14.7	23	12.2
Yes	37	11.9	2	4.2	5	8.2	17	11.5	11	25.6	2	20.0

N = 3279 due to conducting rectal bSTI testing with half of the sample (see Methods section). Cells marked with ‘--’ were suppressed from analyses due to low cell counts.
Bold values reached significance of p<0.05.
bSTI, bacterial sexually transmitted infection; PrEP, pre-exposure prophylaxis.