Logistic regression analysis of risk factors associated with HIV-1 seropositivity among 13 847 MSM participants from seven countries in South America, 1999–2002
| Country/risk factor | Univariate analysis | Multiple analysis | ||||
|---|---|---|---|---|---|---|
| OR | (95% CI) | p Value | AOR | 95% CI | p Value | |
| HIV-1, human immunodeficiency virus type 1; MSM, men who have sex with men; OR, odds ratio; AOR, adjusted odds ratio for age (years) and number of sexual contacts per week; 95% CI, 95% confidence interval; categories in parentheses describe the reference group for odds calculation. | ||||||
| Andean Region | ||||||
| Colombia | ||||||
| STD history (no) | 1.93 | (1.26 to 2.94) | 0.002 | 1.79 | 1.13 to 2.83 | 0.013 |
| Ecuador | ||||||
| Two or three sexual contacts per week (none or one) | 2.22 | (1.21 to 4.08) | 0.010 | 2.20 | 1.17 to 4.12 | 0.014 |
| Four or more sexual contacts per week (none or one) | 2.14 | (1.00 to 4.60) | 0.050 | 2.31 | 1.07 to 5.00 | 0.033 |
| STD history (no) | 2.05 | (1.33 to 3.15) | 0.001 | 1.79 | 1.13 to 2.81 | 0.012 |
| Peru | ||||||
| Four or more sexual contacts per week (none or one) | 2.94 | (2.36 to 3.67) | <0.001 | 3.05 | 2.44 to 3.83 | <0.001 |
| Sexual contact with foreigners (no) | 2.44 | (1.90 to 3.15) | <0.001 | 2.08 | 1.59 to 2.72 | <0.001 |
| STD history (no) | 2.36 | (2.07 to 2.68) | <0.001 | 2.33 | 2.04 to 2.67 | <0.001 |
| Two or three sexual contacts per week (none or one) | 1.62 | (1.23 to 2.15) | 0.001 | 1.58 | 1.18 to 2.10 | 0.002 |
| Bolivia | ||||||
| STD history (no) | 2.89 | (1.58 to 5.26) | 0.001 | 2.69 | 1.45 to 5.00 | 0.002 |
| Use of drugs (no) | 2.80 | (1.55 to 5.06) | 0.001 | 2.95 | 1.60 to 5.45 | 0.001 |
| Use of cocaine (no) | 2.76 | (1.41 to 5.40) | 0.003 | 2.64 | 1.32 to 5.29 | 0.006 |
| Use of injecting drugs (none) | 2.57 | (1.41 to 4.69) | 0.002 | 2.68 | 1.43 to 4.99 | 0.002 |
| Sexual contact with foreigners (no) | 2.31 | (1.27 to 4.20) | 0.006 | 2.17 | 1.18 to 4.02 | 0.013 |
| Use of marijuana (no) | 1.87 | (0.98 to 3.57) | 0.058 | 1.98 | 1.19 to 3.30 | 0.009 |
| Southern Cone | ||||||
| Argentina | ||||||
| STD history (no) | 2.19 | (1.40 to 3.42) | 0.001 | 1.92 | 1.15 to 3.20 | 0.013 |
| Two or three sexual contacts per week (none or one) | 1.59 | (0.89 to 2.86) | 0.121 | 2.01 | 1.10 to 3.67 | 0.023 |
| Uruguay | ||||||
| Use of non-injecting drugs (none) | 6.83 | (1.47 to 31.85) | 0.014 | 8.48 | 1.63 to 43.99 | 0.011 |
| Use of injecting drugs (none) | 3.21 | (1.69 to 6.10) | <0.001 | 2.79 | 1.39 to 5.61 | 0.004 |
| Use of drugs (no) | 2.51 | (1.49 to 4.23) | 0.001 | 2.78 | 1.59 to 4.86 | <0.001 |
| Use of cocaine (no) | 2.47 | (1.42 to 4.29) | 0.001 | 2.67 | 1.49 to 4.78 | 0.001 |
| Sexual contact with foreigners (no) | 2.06 | (1.21 to 3.51) | 0.007 | 2.19 | 1.25 to 3.85 | 0.006 |
| Paraguay | ||||||
| Use of cocaine (no) | 6.48 | (1.70 to 24.75) | 0.002 | 6.14 | 1.50 to 25.14 | 0.012 |