Table S3.
Multiple regression analyses showing associations between age-disparate sex (5+ years older) 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 5+yrs older (vs ≤4yrs) | 1.74 (0.81–3.76) | 2.11*** (1.22–3.66) | 2.02*** (1.24–3.29) | 1.28 (0.78–2.10) | 1.53* (0.92–2.54) |
| 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) | 1.10 (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** (0.14–0.80) | 0.32** (0.12–0.87) | 0.46 (0.14–1.47) | |
| Marital status (ref = single) | |||||
| Married | 0.72 (0.21–2.44) | ||||
| Cohabitating | – | – | – | – | 2.12** (1.08–4.17) |
| Locality (ref = urban formal) | |||||
| Urban informal | 1.25 (0.47–3.31) | 1.78* (0.98–3.26) | 1.45 (0.78–2.72) | 1.27 (0.68–2.39) | 1.28 (0.64–2.57) |
| Rural informal | 0.41* (0.15–1.08) | 0.87 (0.50–1.49) | 0.97 (0.53–1.77) | 1.27 (0.76–2.11) | 1.54 (0.91–2.60) |
| Rural formal | 1.35 (0.37–4.89) | 1.03 (0.46–2.30) | 1.69 (0.80–3.55) | 1.54 (0.80–2.99) | 1.51 (0.76–2.97) |
| Employment status (ref = unemployed) | |||||
| Student | 0.41 (0.13–1.23) | 1.45 (0.73–2.86) | 0.61 (0.30–1.25) | 0.46** (0.23–0.94) | 0.40*** (0.21–0.78) |
| Employed | 0.93 (0.37–2.35) | 0.97 (0.42–2.25) | 0.91 (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 (0.47–2.53) | 0.97 (0.56–1.67) | 1.28 (0.74–2.21) | 2.11*** (1.36–3.27) | 2.69*** (1.72–4.22) |
| Age of first sex ≤15 (vs aged 16+) | 1.06 (0.41–2.71) | 1.16 (0.65–2.06) | 1.45 (0.80–2.61) | 1.49 (0.83–2.67) | 1.55 (0.78–3.05) |
| Multiple sexual partners in past year (vs 1 partner) | 1.78 (0.63–5.02) | 2.81*** (1.32–5.96) | 1.41 (0.56–3.53) | 1.64 (0.83–3.23) | – |
| Number of lifetime partners (ref = 1) | |||||
| 2 lifetime partners | – | – | – | – | 0.87 (0.46–1.63) |
| 3–4 lifetime partners | – | – | – | – | 1.61 (0.85–3.03) |
| 5+ lifetime partners | – | – | – | – | 1.09 (0.41–2.91) |
| Think partner had other partners (vs did not think) | – | – | – | – | 1.95** (1.16–3.27) |
| 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).