Table S10.
Multiple regression analyses showing associations between years age difference between partners (continuous) and covariates with HIV status for young black women aged 15 to 24 years, South Africa 2002, 2005, 2008, and 2012.
| 2002 (A) N=309 |
2005 (A) N=994 |
2008 (A) N=642 |
2012 (A) N=1039 |
2012 (B) N=939 |
|
|---|---|---|---|---|---|
| aOR (95% CI) | aOR (95% CI) | aOR (95% CI) | aOR (95% CI) | aOR (95% CI) | |
| Years age difference (continuous) | 1.21*** (1.07–1.37) | 1.09*** (1.03–1.16) | 1.08** (1.01–1.16) | 1.08** (1.01–1.16) | 1.08** (1.01–1.15) |
| Age | 1.14 (0.92–1.40) | 1.22*** (1.08–1.38) | 1.21*** (1.05–1.38) | 1.12** (1.00–1.25) | 1.09 (0.96–1.23) |
| Married (vs unmarried) | 0.55 (0.14–2.13) | 0.33** (0.13–0.81) | 0.32** (0.12–0.89) | 0.42 (0.13–1.39) | 0.70 (0.20–2.37) |
| Marital status (ref = single) | |||||
| Married | |||||
| Cohabitating | – | ||||
| Locality (ref = urban formal) | |||||
| Urban informal | 0.94 (0.33–2.73) | 1.65 (0.90–3.03) | 1.45 (0.77–2.73) | 1.23 (0.64–2.34) | 1.26 (0.62–2.57) |
| Rural informal | 0.35** (0.13–0.95) | 0.79 (0.45–1.40) | 0.97 (0.53–1.78) | 1.23 (0.74–2.04) | 1.48 (0.88–2.50) |
| Rural formal | 0.70 (0.20–2.52) | 0.95 (0.42–2.14) | 1.60 (0.76–3.38) | 1.46 (0.72–2.95) | 1.55 (0.76–3.16) |
| Employment status (ref = unemployed) | |||||
| Student | 0.45 (0.14–1.42) | 1.46 (0.73–2.89) | 0.58 (0.28–1.21) | 0.48** (0.23–0.99) | 0.40*** (0.21–0.78) |
| Employed | 0.38* (0.13–1.10) | 0.92 (0.37–2.26) | 0.93 (0.40–2.18) | 0.82 (0.42–1.61) | 1.18 (0.53–2.60) |
| Condom used at last sex (vs not used) | 1.01** (0.41–2.48) | 0.98 (0.57–1.69) | 1.20 (0.67–2.14) | 2.13*** (1.38–3.29) | 2.58*** (1.63–4.07) |
| Age of first sex ≤15 (vs 16+) | 0.65 (0.21–2.02) | 1.17 (0.67–2.06) | 1.45 (0.79–2.64) | 1.43 (0.78–2.60) | 1.49 (0.75–2.98) |
| Multiple sexual partners in past year (vs 1 partner) | 2.71* (0.90–8.17) | 2.91*** (1.33–6.37) | 1.50 (0.60–3.73) | 1.52 (0.77–3.00) | |
| Number of lifetime partners (ref = 1) | |||||
| 2 lifetime partners | – | – | – | – | 0.80 (0.42–1.54) |
| 3–4 lifetime partners | – | – | – | – | 1.55 (0.82–2.96) |
| 5+ lifetime partners | – | – | – | – | 1.08 (0.41–2.86) |
| Think partner had MSPs (vs did not think) | – | – | – | – | 1.93** (1.15–3.24) |
| Income last month >R4000 (vs ≤R4000) | – | – | – | – | 0.07*** (0.01–0.48) |
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).