Table S6.
Multiple regression analyses showing associations between age-disparate sex (5+ years older, considering most recent partner only) and covariates with HIV status for young women aged 15 to 24 years, South Africa 2002, 2005, 2008, and 2012.
| 2002 (A) N=446 |
2005 (A) N=994 |
2008 (A) N=854 |
2012 (A) N=1394 |
2012 (B) N=1257 |
|
|---|---|---|---|---|---|
| aOR (95% CI) | aOR (95% CI) | aOR (95% CI) | aOR (95% CI) | aOR (95% CI) | |
| Age-disparate sex 5+ yrs older (vs ≤4yrs) | 1.74 (0.81–3.77) | 2.09*** (1.22–3.59) | 2.01*** (1.23–3.29) | 1.29 (0.78–2.12) | 1.54* (0.93–2.55) |
| Age | 1.04 (0.86–1.25) | 1.23*** (1.09–1.39) | 1.22*** (1.07–1.39) | 1.13** (1.01–1.26) | 1.20 (0.97–1.24) |
| Non-black African (vs black African) | 0.40* (0.14–1.14) | 0.03*** (0.01–0.08) | 0.11*** (0.05–0.27) | 0.07*** (0.03–0.18) | 0.10*** (0.03–0.27) |
| Married (vs unmarried) | 0.75 (0.21–2.74) | 0.33** (0.14–0.81) | 0.32** (0.12–0.87) | 0.46 (0.14–1.47) | |
| Marital status (ref = single) | |||||
| Married | 0.71 (0.21–2.44) | ||||
| Cohabitating | – | 2.12** (1.08–4.17) | |||
| Locality (ref = urban formal) | |||||
| Urban informal | 1.25 (0.47–3.31) | 1.76* (0.96–3.22) | 1.46 (0.78–2.73) | 1.27 (0.68–2.39) | 1.28 (0.64–2.56) |
| Rural informal | 0.41 (0.13–1.23) | 0.86 (0.50–1.49) | 0.97 (0.53–1.77) | 1.27 (0.76–2.11) | 1.54 (0.91–2.60) |
| Rural formal | 1.34 (0.37–4.89) | 1.02 (0.46–2.30) | 1.68 (0.80–3.54) | 1.54 (0.80–3.00) | 1.50 (0.76–2.97) |
| Employment status (ref = unemployed) | |||||
| Student | 0.40 (0.13–1.23) | 1.48 (0.74–2.94) | 0.61 (0.30–1.24) | 0.46** (0.23–0.94) | 0.40*** (0.21–0.78) |
| Employed | 0.93 (0.37–2.35) | 0.97 (0.42–2.24) | 0.90 (0.40–2.04) | 0.79 (0.41–1.51) | 1.17 (0.54–2.53) |
| Condom used at last sex (vs not used) | 1.09 (0.47–2.52) | 0.96 (0.56–1.65) | 1.28 (0.74–2.22) | 2.11*** (1.36–3.27) | 2.70*** (1.72–4.22) |
| Age of first sex ≤15 (vs aged 16+) | 1.05 (0.41–2.71) | 1.14 (0.64–2.04) | 1.45 (0.80–2.62) | 1.48 (0.83–2.66) | 1.55 (0.78–3.05) |
| Multiple sexual partners in past year (vs 1 partner) | 1.78 (0.63–5.04) | 3.33*** (1.60–6.95) | –1.44 (0.57–3.63) | 1.64 (0.83–3.24) | – |
| Number of lifetime partners (ref = 1) | |||||
| 2 lifetime partners | – | – | – | – | 0.87 (0.46–1.63) |
| 3–4 lifetime partners | – | – | – | – | 1.61 (0.85–3.04) |
| 5+ lifetime partners | – | – | – | – | 1.09 (0.41–2.91) |
| Think partner had other partners (vs did not think) | – | – | – | – | 1.95** (1.17–3.27) |
| Income last month >R4000 (vs ≤R4000) | – | – | – | – | 0.06*** (0.01–0.41) |
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 non-response (by using weighted data).