Association between sociodemographic variables and UAS during the past 3 months, logistic regression analysis
| Unadjusted | Adjusted | ||
|---|---|---|---|
| Independent variables | UAS (%) | OR (95% CI) | OR (95% CI) |
| Age (years) | |||
| 18–20 | 36 | Ref | Ref |
| 21–22 | 34 | 0.91 (0.62 to 1.34) | 0.99 (0.64 to 1.52) |
| 23–25 | 43 | 1.32 (0.88 to 1.98) | 1.12 (0.69 to 1.79) |
| 26–30 | 53 | 1.95 (1.20 to 3.18)* | 1.66 (0.92 to 2.97) |
| >30 | 46 | 1.49 (0.79 to 2.82) | 1.20 (0.56 to 2.59) |
| Education (highest level started) | |||
| 12 years or less | 41 | Ref | Ref |
| 2-year college | 46 | 1.21 (0.64 to 2.29) | 0.81 (0.39 to 1.70) |
| 3-year college | 40 | 0.97 (0.58 to 1.60) | 0.78 (0.43 to 1.42) |
| Bachelor level, university | 37 | 0.85 (0.55 to 1.31) | 0.73 (0.43 to 1.24) |
| Masters/doctorate level university | 56 | 1.84 (0.83 to 4.09) | 1.11 (0.44 to 2.76) |
| Income (million VND all sources) | |||
| 0–less than 1 | 25 | Ref | Ref |
| 1–less than 3 | 40 | 1.98 (1.14 to 3.45)* | 2.37 (1.28 to 4.36)* |
| 3–less than 5 | 46 | 2.48 (1.40 to 4.39)* | 2.54 (1.33 to 4.87)* |
| Above 5 | 44 | 2.31 (1.27 to 4.20)* | 2.04 (1.02 to 4.08)* |
| Province | |||
| HCMC | 33 | Ref | Ref |
| Ha Noi | 50 | 1.98 (1.41 to 2.79)* | 2.30 (1.57 to 3.38)* |
| Hai Phong | 51 | 2.08 (1.15 to 3.78)* | 2.25 (1.14 to 4.44)* |
| Khang Hoa | 53 | 2.22 (0.88 to 5.63) | 1.96 (0.68 to 5.62) |
| Can Tho | 40 | 1.33 (0.22 to 8.10) | 1.21 (0.19 to 7.63) |
| Da Nang | 43 | 1.50 (0.51 to 4.43) | 3.18 (0.76 to 13.23) |
| Other | 31 | 0.91 (0.60 to 1.38) | 1.16 (0.72 to 1.87) |
| Internet use (days per month) | |||
| 1–7 | 23 | Ref | Ref |
| 8–14 | 41 | 2.26 (1.03 to 4.95)* | 1.69 (0.68 to 4.21) |
| 15–21 | 49 | 3.17 (1.57 to 6.40)* | 2.06 (0.90 to 4.73) |
| 22–30 | 39 | 2.07 (1.09 to 3.95)* | 1.51 (0.69 to 3.32) |
| Partner preference | |||
| Prefer only men | 45 | Ref | Ref |
| Prefer men to women | 43 | 0.90 (0.64 to 1.28) | 0.77 (0.53 to 1.11) |
| Prefer women to men | 18 | 0.26 (0.07 to 0.91)* | 0.18 (0.05 to 0.66)* |
| Prefer only women | 2 | 0.02 (0.00 to 0.16)* | 0.02 (0.00 to 0.17)* |
*p<0.05 (not adjusted for multiple comparisons).
CI, confidence interval; HCMC, Ho Chi Minh City; UAS, unprotected anal sex.