Table 1 Socio-demographic characteristics among MSM by nitrite inhalants use status (N = 1151)
Characteristics | n | Percentage, 95% CI | Nitrite inhalants users (n, %) | Non–users (n, %) | P value |
|---|---|---|---|---|---|
Age (years), mean ± SD | 30.44 ± 9.35 |  | 28.19 ± 6.28 | 30.9 ± 9.82 |  |
 ≤ 25 | 410 | 35.6 (32.9–38.5) | 82 (40.2) | 328 (34.6) | 0.001 |
 26–35 | 491 | 42.7 (39.7–45.4) | 98 (48.0) | 393 (41.5) |  |
 > 35 | 250 | 21.7 (19.5–24.2) | 24 (11.8) | 226 (23.9) |  |
Residence in Chongqing | |||||
 Yes | 856 | 74.4 (71.9–76.8) | 148 (72.5) | 708 (74.8) | 0.511 |
 No | 295 | 25.6 (23.2–28.1) | 56 (27.5) | 239 (25.2) |  |
Education | |||||
 Senior high school and below | 358 | 31.1 (28.4–33.7) | 64 (31.4) | 294 (31.0) | 0.927 |
 College and above | 793 | 68.9 (66.3–71.6) | 140 (68.6) | 653 (69.0) |  |
Occupation | |||||
 Enterprise, public institution or government | 186 | 16.2 (14.1–18.2) | 23 (11.3) | 163 (17.2) | 0.002 |
 Service industry, solo business owner | 770 | 66.9 (64.0–69.5) | 158 (77.4) | 612 (64.6) |  |
 Retired, unemployed or student | 195 | 16.9 (14.9–19.1) | 23 (11.3) | 172 (18.2) |  |
Marital status | |||||
 Never married | 915 | 79.5 (77.0–81.8) | 180 (88.2) | 735 (77.6) | < 0.001 |
 Married | 162 | 14.1 (12.1–16.2) | 11 (5.4) | 151 (16.0) |  |
 Divorced or widowed | 74 | 6.4 (5.0–7.8) | 13 (6.4) | 61 (6.4) |  |
Individual monthly income (CNY) | |||||
 < 3000 | 217 | 18.9 (16.6–21.1) | 25 (12.3) | 192 (20.3) | 0.008 |
 ≥ 3000 | 934 | 81.1 (78.9–83.4) | 179 (87.7) | 755 (79.7) |  |