Variable | Category | Univariate logistic regression | Multivariate Logistic regression | ||
---|---|---|---|---|---|
OR (95% CI) | p | OR (95% CI) | p | ||
Age | Per advanced year | 0.71 (0.65, 0.77) | < 0.001 | 0.77 (0.70, 0.86) | < 0.001 |
Field of study | Nonmedical | Ref | Â | Â | Â |
 | Medical | 1.33 (0.75, 2.38) | 0.333 | – |  |
Living with sexual partner | No | Ref | Â | Â | Â |
 | Yes | 0.72 (0.38, 1.34) | 0.296 | – |  |
Ethnicity | Han | 1.12 (0.70, 1.81) | 0.633 | – |  |
 | Others | Ref |  |  |  |
Grade | Per advanced grade | 0.68 (0.61, 0.76) | < 0.001 | 0.80 (0.70, 0.91) | 0.001 |
Area of residence | Urban | Ref | Â | Â | Â |
 | Rural | 0.79 (0.63, 1.01) | 0.076 | NS |  |
Sexual orientation | Â | Â | 0.997 | Â | Â |
 | Heterosexual | 1.01 (0.71, 1.47) |  | – |  |
 | Homosexual | 1.00 (0.55, 1.81) |  | – |  |
 | Bisexual | 0.84 (0.47, 1.53) |  | – |  |
 | Unclear | Ref |  |  |  |
Cigarette smoking | Yes | 0.71 (0.54, 0.95) | 0.021 | NS | Â |
 | No | Ref |  |  |  |
Alcohol drinking | Yes | 0.69 (0.53, 0.89) | 0.005 | 0.71 (0.55, 0.93) | 0.012 |
 | No | Ref |  |  |  |
HIV knowledge | Insufficient | Ref | Â | Â | Â |
 | Sufficient | 1.4 (1.09, 1.87) | 0.011 | NS |  |
Attitude towards sex | Multiple sexual partners | 1.07 (0.76, 1.49) | 0.697 | Â | Â |
 | Selling sex | 0.77 (0.57, 1.05) | 0.100 |  |  |
 | Extramarital sex | 1.10 (0.77, 1.58) | 0.597 |  |  |
 | Paid sex | 0.68 (0.52, 0.89) | 0.005 | 0.72 (0.54, 0.95) | 0.021 |
 | One-night stand | 0.82 (0.64, 1.07) | 0.144 |  |  |
 | Homosexual behaviour | 0.77 (0.61, 0.98) | 0.033 | NS |  |
 | Premarital sex | 0.92 (0.69, 1.23) | 0.568 |  |  |