Table 2.
Bivariate analysis of alter-related risk factors of incident HIV infection
| Characteristic | Cases/person-years | Incidence/100 person-years* | Unadjusted HRs (95% CI)** | RDS-adjusted HRs (95% CI)*** |
|---|---|---|---|---|
| Social Network (No. of known MSM) | ||||
| ≤10 | 34/216 | 15.73 | Ref. | Ref. |
| 11–20 | 20/117 | 17.16 | 1.11 (0.6–1.9) | 1.88 (0.8–4.4) |
| ≥21 | 27/193 | 13.97 | 0.94 (0.6–1.6) | 1.13 (0.7–2.0) |
| Sexual Network (up to 5 reported alters) | ||||
| 0–1 | 4/145 | 2.76 | Ref. | Ref. |
| 2–3 | 22/186 | 11.81 | 4.10 (1.4–11.9) | 5.16 (1.3–19.9) |
| 4–5 | 41/190 | 21.60 | 7.47 (2.7–20.9) | 6.91 (2.2–21.6) |
| Density within reported sexual network | ||||
| No linkages | 24/166 | 14.47 | Ref. | Ref. |
| Less than 50% linked | 21/81 | 25.98 | 1.76 (1.0–3.2) | 2.96 (0.9–9.9) |
| More than 50% linked | 2½01 | 10.47 | 0.73 (0.4–1.3) | 0.93 (0.3–3.4) |
| Average strength of friendship with alters | ||||
| low | 4/72 | 5.57 | Ref. | Ref. |
| medium | 25/205 | 12.19 | 2.06 (0.7–5.9) | 2.19 (1.0–4.9) |
| high | 37/240 | 15.45 | 2.48 (0.9–7.0) | 3.75 (1.5–9.2) |
| Percentage of Alters older by 5+ years | ||||
| 0% | 14/230 | 6.09 | Ref. | Ref. |
| 1–50% | 25/134 | 18.73 | 2.93 (1.5–5.6) | 4.00 (1.7–9.2) |
| 51–100% | 27/144 | 18.71 | 3.01 (1.6–5.7) | 4.32 (1.5–12.3) |
| Percentage of Alters with higher SES | ||||
| 0% | 7/150 | 4.66 | Ref. | Ref. |
| 1–50% | 15/140 | 10.73 | 2.25 (0.9–5.5) | 1.48 (0.3–6.7) |
| 51–100% | 45/224 | 20.08 | 4.05 (1.8–9.0) | 5.82 (1.4–25.0) |
| Percentage of Alters with more education | ||||
| 0% | 24/287 | 8.36 | Ref. | Ref. |
| 1–50% | 9/51 | 17.78 | 1.95 (0.9–4.2) | 2.91 (1.8–4.6) |
| 51–100% | 32/168 | 19.02 | 2.24 (1.3–3.8) | 4.31 (1.5–12.1) |
| Percentage of Alters are regular partners | ||||
| 0% | 10/147 | 6.81 | Ref. | Ref. |
| 1–50% | 38/264 | 14.39 | 2.00 (1.0–4.0) | 3.21 (1.5–6.9) |
| 51–100% | 19/107 | 17.78 | 2.38 (1.1–5.1) | 4.56 (1.0–21.4) |
| Percentage of Alters are casual partners | ||||
| 0% | 5/82 | 6.12 | Ref. | Ref. |
| 1–50% | 22/104 | 21.07 | 3.44 (1.3–9.1) | 2.28 (0.9–6.1) |
| 51–100% | 40/332 | 12.06 | 2.07 (0.8–5.2) | 1.07 (0.2–5.2) |
| Percentage of Alters who identify as bisexual | ||||
| 0% | 10/108 | 9.30 | Ref. | Ref. |
| 1–50% | 16/123 | 13.00 | 1.42 (0.6–3.1) | 0.75 (0.3–2.2) |
| 51–100% | 39/284 | 13.75 | 1.47 (0.7–2.9) | 1.21 (0.7–2.1) |
| Percentage of Alters perceived as high risk for HIV | ||||
| 0% | 46/392 | 11.74 | Ref. | Ref. |
| 1–50% | 13/88 | 14.77 | 1.22 (0.7–2.3) | 1.51 (0.5–4.7) |
| 51–100% | 5/27 | 18.78 | 1.55 (0.6–3.9) | 2.44 (1.2–4.9) |
Abbreviations: No, number; MSM, men who have sex with men; SES, socio-economic status; HR, hazard ratios; CI, confidence intervals; P, p-value.
*
Incidence per 100 person-years calculated using Poisson Regression.
**
Crude Hazard ratios calculated using Cox Proportional Hazards Model.
***
Adjusted for RDS-weights. Bolded indicates p<0.05.