Table 1 Association of having sex or meeting sex partner at bathhouses and sex clubs with demographic and behavioural characteristics.

Demographic characteristics	Total	Had sex or met sex partner at bathhouses and sex clubs†
		Yes No (%)	No No (%)	p Value
Overall age (years)	1351	346 (25.6)	1005 (74.4)	0.003*
<20	17	0	17 (1.7)
20–29	271	54 (15.6)	217 (21.6)
30–39	579	163 (47.1)	416 (41.4)
40–49	381	109 (31.5)	272 (27.1)
50+	103	20 (5.9)	83 (8.3)
Race/ethnicity				0.131
White	636	171 (49.4)	465 (46.3)
African American	132	25 (7.2)	107 (10.7)
Hispanic	502	124 (35.8)	378 (37.6)
Other/mixed	81	26 (7.5)	55 (5.5)
HIV positive				0.001*
Yes	835	241 (73.9)	593 (63.0)
No	433	85 (26.1)	348 (37.0)
Anal insertive sex				0.007*
Yes	1057	285 (86.1)	772 (79.4)
No	246	46 (13.9)	200 (20.6)
Anal receptive sex				0.009*
Yes	1026	281 (84.1)	745 (77.4)
No	271	53 (15.9)	218 (22.6)
Oral sex				0.069
Yes	1251	327 (97.0)	924 (94.6)
No	63	10 (3.0)	53 (5.4)
Anonymous partner				<0.001*
Yes	1044	320 (93.8)	724 (73.9)
No	276	21 (6.2)	255 (26.1)
Condom used‡				<0.001*
Yes	701	102 (33.7)	599 (68.1)
No	482	201 (66.3)	281 (31.9)
Incarcerated past year				0.250
Yes	53	10 (3.4)	43 (5.0)
No	1111	288 (96.6)	823 (95.0)
Injecting drug user				0.148
Yes	30	11 (3.3)	19 (1.9)
No	1273	319 (96.7)	954 (98.1)
Non‐injecting drug user				<0.001*
Yes	360	118 (36.2)	242 (25.2)
No	925	208 (63.8)	717 (74.8)

Totals numbers in each group may differ because of missing data.

*p Value<0.05.

†Had sex or met sex partners during the period when syphilis infection probably occurred (critical period).

‡Condom was used at last intercourse.