| Item | Non-depression | Depression | Total | n | % | 95% CI | n | % | 95% CI | n | % |
| Age (Year) | | | | | | | | | ≤20 | 38 | 12.2 | 8.6, 15.9 | 53 | 15.5 | 11.6, 19.4 | 91 | 13.9 | 21–30 | 139 | 44.7 | 39.1, 50.3 | 133 | 38.9 | 33.7, 44.1 | 272 | 41.7 | 31–40 | 77 | 24.8 | 19.9, 29.6 | 93 | 27.2 | 22.5, 31.9 | 170 | 26.0 | 41 and above | 57 | 18.3 | 14.0, 22.7 | 63 | 18.4 | 14.3, 22.6 | 120 | 18.4 | Education | | | | | | | | | Primary school and below | 66 | 21.2 | 16.7, 25.8 | 87 | 25.4 | 20.8, 30.1 | 153 | 23.4 | Middle school | 188 | 60.5 | 55.0, 65.9 | 187 | 54.7 | 49.4, 60.0 | 375 | 57.4 | Senior high school and above | 57 | 18.3 | 14.0, 22.7 | 68 | 19.9 | 15.6, 24.1 | 125 | 19.1 | Marital Status | | | | | | | | | Unmarried | 121 | 39.8 | 34.3, 45.3 | 152 | 44.6 | 39.3, 49.9 | 273 | 42.3 | Married | 137 | 45.1 | 39.4, 50.7 | 144 | 42.2 | 37.0, 47.5 | 281 | 43.6 | Others | 46 | 15.1 | 11.1, 19.2 | 45 | 13.2 | 9.6, 16.8 | 91 | 14.1 | Living Status | | | | | | | | | Alone | 162 | 52.4 | 46.8, 58.0 | 165 | 48.5 | 43.2, 53.9 | 327 | 50.4 | With partner | 72 | 23.3 | 18.6, 28.0 | 88 | 25.9 | 21.2, 30.6 | 160 | 24.7 | Others | 75 | 24.3 | 19.5, 29.1 | 87 | 25.6 | 20.9, 30.3 | 162 | 25.0 | Monthly income | | | | | | | | | ≤450 | 144 | 46.3 | 40.7, 51.9 | 151 | 44.2 | 38.9, 49.4 | 295 | 45.2 | 451–749 | 146 | 46.9 | 41.4, 52.5 | 148 | 43.3 | 38.0, 48.6 | 294 | 45.0 | ≥750 | 21 | 6.8 | 3.9, 9.6 | 43 | 12.6 | 9.0, 16.1 | 64 | 9.8 | Residency | | | | | | | | | Study city | 73 | 23.8 | 19.0, 28.6 | 61 | 18.0 | 13.9, 22.2 | 134 | 20.7 | Another city in Guangdong province | 20 | 6.5 | 3.7, 9.3 | 34 | 10.0 | 6.8, 13.2 | 54 | 8.4 | Another province | 214 | 69.7 | 64.5, 74.9 | 244 | 72.0 | 67.2, 76.8 | 458 | 70.9 | STDs related Service | | | | | | | | | No | 53 | 21.5 | 16.3, 26.6 | 46 | 17.2 | 12.7, 21.8 | 99 | 19.3 | Yes | 194 | 78.5 | 73.4, 83.7 | 221 | 82.8 | 78.2, 87.3 | 415 | 80.7 | Syphilis related Knowledge | | | | | | | | | No | 201 | 64.6 | 59.3, 70.0 | 191 | 55.8 | 50.6, 61.1 | 392 | 60.0 | Yes | 110 | 35.4 | 30.0, 40.7 | 151 | 44.2 | 38.9, 49.4 | 261 | 40.0 | Condom use during the last work | | | | | | | | | No | 64 | 20.7 | 16.2, 25.3 | 69 | 20.4 | 16.1, 24.7 | 133 | 20.5 | Yes | 245 | 79.3 | 74.7, 83.8 | 270 | 79.6 | 75.3, 83.9 | 515 | 79.5 | Frequency of condom use in the last month with clients | | | | | | | | | Sometimes | 109 | 35.0 | 29.7, 40.4 | 130 | 38.0 | 32.8, 43.2 | 239 | 36.6 | Always | 202 | 65.0 | 59.6, 70.3 | 212 | 62.0 | 55.8, 67.2 | 414 | 63.4 | Primary sex partners | | | | | | | | | No | 86 | 27.7 | 22.7, 32.7 | 133 | 38.9 | 33.7, 44.1 | 219 | 33.5 | Yes | 225 | 72.3 | 67.4, 77.4 | 209 | 61.1 | 55.9, 66.3 | 434 | 66.5 | Condom use during the last sex with primary partners | | | | | | | | | No | 120 | 53.3 | 46.8, 59.9 | 70 | 33.7 | 27.2, 40.1 | 190 | 43.9 | Yes | 105 | 46.7 | 40.1, 53.2 | 138 | 66.3 | 59.9, 72.8 | 243 | 56.1 | Frequency of condom use in the last month with primary partners | | | | | | | | | Sometimes | 237 | 76.2 | 71.5, 81.0 | 247 | 72.2 | 67.5, 77.0 | 484 | 74.1 | Always | 74 | 23.8 | 19.0, 28.6 | 95 | 27.8 | 23.0, 32.6 | 169 | 25.9 | STDs Symptoms | | | | | | | | | No | 197 | 63.3 | 58.0, 68.7 | 237 | 69.3 | 64.4, 74.2 | 434 | 66.5 | Yes | 114 | 36.7 | 31.3, 42.0 | 105 | 30.7 | 25.8, 35.6 | 219 | 33.5 | Drug Use | | | | | | | | | No | 307 | 98.7 | 97.5, 100.0 | 339 | 99.1 | 98.1, 100.0 | 646 | 98.9 | Yes | 4 | 1.3 | 0.0, 2.6 | 3 | 0.9 | 0.0, 1.9 | 7 | 1.1 | HIV | | | | | | | | | No | 310 | 99.7 | 99.1, 100.0 | 339 | 99.1 | 98.1, 100.0 | 649 | 99.4 | Yes | 1 | 0.3 | 0.0, 1.0 | 3 | 0.9 | 0.0, 1.9 | 4 | 0.6 | Syphilis | | | | | | | | | No | 291 | 93.6 | 90.8, 96.3 | 329 | 96.2 | 94.2, 98.2 | 620 | 94.9 | Yes | 20 | 6.4 | 3.7, 9.2 | 13 | 3.8 | 1.8, 5.8 | 33 | 5.1 | HCV | | | | | | | | | No | 306 | 98.4 | 97.0, 99.8 | 334 | 97.7 | 96.1, 99.3 | 640 | 98.0 | Yes | 5 | 1.6 | 0.2, 3.0 | 8 | 2.3 | 0.7, 3.9 | 13 | 2.0 |
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