Nitrite Inhalants Use and HIV Infection among Men Who Have Sex with Men in China

Table 2

Predictors for nitrite inhalants use among MSM in Beijing (𝑁=400).

Factors	𝑁 (% )	Crude odds ratio (95% CI)	Adjusted odds ratio (95% CI)
Model 1	Lifetime nitrite inhalants use
Age
≥25	140 (44.0)	0.53 (0.32, 0.87)*	0.47 (0.27, 0.83)^†
<25	49 (59.8)
Ever married
No	152 (51.5)	1.95 (1.23, 3.10)^†
Yes (others)	37 (35.2)	1.00
Years of schooling
>12	140 (54.3)	2.25 (1.47, 3.44)^†	2.02 (1.24, 3.29)^†
≤12	49 (34.5)	1.00	1.00
Sexual orientation
Homosexual	147 (51.4)	1.81 (1.16, 2.83)^†
Others	42 (36.8)	1.00
Venue for seeking sex partners
Internet	158 (54.9)	3.18 (1.98, 5.10)^†	2.49 (1.45, 4.28)^†
Others (park, bathroom)	31 (27.7)	1.00	1.00
Number of male sex partners in P3M
>1	119 (54.6)	1.92 (1.29, 2.87)^†
≤1	61 (42.1)	1.00
Protected anal sex in P3M
Yes	80 (44.9)	0.69 (0.46, 1.05)
No	100 (54.1)	1.00
Having a casual partner in P3M
Yes	135 (51.7)	1.69 (1.11, 2.56)*	2.04 (1.26, 3.30)^†
No	54 (38.9)	1.00	1.00
HIV serostatus
Positive	17 (70.8)	2.88 (1.17, 7.11)*	3.16 (1.16, 8.67)*
Negative	172 (45.7)	1.00	1.00
Model 2	Recent nitrite inhalants use in the P3M
Age
≥ 25	62 (19.5)	0.7 (0.4, 1.2)
< 25	21 (25.6)	1.00
Years of schooling
>12	65 (25.2)	2.3 (1.3, 4.1)^†
≤12	18 (12.7)	1.00
Sexual orientation
Homosexual	64 (22.6)	1.4 (0.8, 2.5)
Other	19 (16.7)	1.00
Venue for seeking sexual partners
Internet	73 (25.4)	3.5 (1.7, 7.0)^†	3.9 (1.7, 8.9)^†
Others (park, bathroom)	10 (8.9)	1.00	1.00
Number of male sex partners in P3M
> 1	57 (26.2)	2.1 (1.3, 3.6)^†	5.0 (1.7, 14.9)^†
≤ 1	26 (14.3)	1.00
Protected anal sex with casual partners in P3M
Yes	25 (18.8)	0.5 (0.3, 0.9)*	0.5 (0.2, 0.9)*
No	35 (32.7)	1.00	1.00
HIV serostatus
Positive	5 (20.8)	1.0 (0.4, 2.8)
Negative	78 (20.7)	1.00
Syphilis serostatus
Positive	16 (17.6)	0.8 (0.4, 1.4)
Negative	67 (21.7)	1.00

Note: P3M: the past 3 months; P12M: the past 12 months; ^∗𝑃<0.05; ^†𝑃<0.01.