| N | 0DUs (n = 3221) | 1DUs (n = 1050) | 2DUs (n = 155) | 3DUs (n = 70) | P for trend |
---|---|---|---|---|---|---|
Age (years) | ||||||
 18–25 | 1617 | 1123 | 412 | 59 | 23 | 0.087 |
 26–30 | 1181 | 721 | 375 | 63 | 22 | < 0.001 |
  > 30 | 1698 | 1377 | 263 | 33 | 25 | < 0.001 |
Residence | ||||||
 Local cities | 1785 | 1327 | 385 | 45 | 28 | 0.002 |
 Non-local cities | 2711 | 1894 | 665 | 110 | 42 | 0.002 |
Education | ||||||
 Junior school or below | 916 | 674 | 169 | 45 | 28 | 0.17 |
 High school | 1201 | 877 | 269 | 37 | 18 | 0.227 |
 College or above | 2379 | 1670 | 612 | 73 | 24 | 0.972 |
Marital status | ||||||
 Never married | 3303 | 2266 | 860 | 129 | 48 | < 0.001 |
 Married | 1193 | 955 | 190 | 26 | 22 | < 0.001 |
Occupation | ||||||
 Student | 565 | 418 | 127 | 16 | 4 | 0.058 |
 Non-student | 3931 | 2803 | 923 | 139 | 66 | 0.058 |
Monthly income (USD) | ||||||
 No income | 769 | 591 | 146 | 25 | 7 | 0.001 |
 1–599 | 2858 | 2069 | 658 | 94 | 37 | 0.042 |
  ≥ 600 | 869 | 561 | 246 | 36 | 26 | < 0.001 |
Primary sex position during AIa | ||||||
 Top | 1395 | 1053 | 291 | 34 | 17 | < 0.001 |
 Bottom | 988 | 725 | 222 | 31 | 10 | 0.067 |
 Versatile | 2022 | 1371 | 527 | 82 | 42 | < 0.001 |
Knowledge of HIV prevention | ||||||
 Inadequate | 2730 | 1861 | 676 | 128 | 65 | < 0.001 |
 Adequate | 1766 | 1360 | 374 | 27 | 5 | < 0.001 |