Table S2.
Bivariate regression analyses showing associations between select sociodemographic and sexual behaviours with HIV status for young women aged 15–24 years, South Africa 2002, 2005, 2008, and 2012.
| 2002 OR (95% CI) | 2005 OR (95% CI) | 2008 OR (95% CI) | 2012 OR (95% CI) | |
|---|---|---|---|---|
| Age-disparate sex 5+ yrs older (vs ≤4yrs) | 1.73 (0.86–3.45) | 2.28*** (1.41–3.69) | 1.88*** (1.17–3.03) | 1.25 (0.77–2.02) |
| Age difference in years (continuous) | 1.08 (0.98–1.19) | 1.10*** (1.04–1.16) | 1.07** (1.00–1.14) | 1.08** (1.02–1.15) |
| Sociodemographics | ||||
| Age | 1.09 (0.94–1.26) | 1.19*** (1.07–1.32) | 1.20*** (1.08–1.33) | 1.15*** (1.05–1.25) |
| Non-black African (vs black African) | 0.56 (0.19–1.65) | 0.05*** (0.02–0.15) | 0.12*** (0.05–0.29) | 0.06*** (0.02–0.15) |
| Married (vs unmarried) | 0.81 (0.28–2.34) | |||
| Marital status (ref = single) | ||||
| Married | 0.32*** (0.15–0.67) | 0.47* (0.19–1.14) | 0.43 (0.14–1.29) | |
| Cohabitating | 0.74 (0.33–1.65) | 1.29 (0.59–2.80) | 1.31 (0.70–2.46) | |
| Locality (ref = urban formal) | ||||
| Urban informal | 2.13* (0.87–5.18) | 2.37*** (1.38–4.08) | 1.93** (1.09–3.41) | 1.81* (0.92–3.56) |
| Rural informal | 0.52 (0.23–1.18) | 1.10 (0.65–1.85) | 1.02 (0.55–1.86) | 1.56* (0.98–2.48) |
| Rural formal | 1.50 (0.52–4.36) | 1.07 (0.53–2.16) | 1.90* (0.91–3.96) | 0.79 (0.38–1.64) |
| Employment status (ref = unemployed) | ||||
| Student | 0.45* (0.18–1.13) | 0.88 (0.48–1.63) | 0.47** (0.25–0.88) | 0.46*** (0.26–0.81) |
| Employed | 0.94 (0.36–2.45) | 0.63 (0.33–1.21) | 0.8 (0.40–1.60) | 0.64 (0.34–1.20) |
| Sexual Behaviour | ||||
| Condom used at last sex (vs condom not used) | 1.23 (0.62–2.45) | 1.17 (0.76–1.82) | 1.09 (0.66–1.79) | 1.85*** (1.21–2.83) |
| Aged ≤15 at first sex (vs aged 16+) | 0.87 (0.39–1.95) | 0.98 (0.58–1.68) | 1.13 (0.65–1.97) | 1.18 (0.65–2.15) |
| Multiple sexual partners in past year (vs 1 partner) | 1.97 (0.76–5.07) | 2.74*** (1.36–5.54) | 1.03 (0.43–2.44) | 1.45 (0.78–2.72) |
| Additional variables measured in 2012 | ||||
| Income past month >R4000 (vs ≤R4000) | – | – | – | 0.13*** (0.04–0.44) |
| Number of lifetime partners (ref = 1 partner) | ||||
| 2 lifetime partners | – | – | – | 1.08 (0.61–1.91) |
| 3–4 lifetime partners | – | – | – | 2.15*** (1.22–3.78) |
| 5+ lifetime partners | – | – | – | 1.43 (0.62–3.26) |
| Think partner had other sexual partners (vs did not think) | – | – | – | 2.48*** (1.54–3.99) |
Note: *=p<0.10; **=p<0.05; and ***=p<0.01
All analyses were adjusted to account for the complex study design (i.e. stratification and clustering) and for survey non-response (by using weighted data).