Table S9.
Multiple regression analyses showing associations between age-disparate sex (5+ years older) and covariates with HIV status for young black African women aged 15–24 years, South Africa 2002, 2005, 2008, and 2012.
| 2002 (A) N=309 |
2005 (A) N=746 |
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) | 2.39** (1.01–5.64) | 2.11*** (1.21–3.68) | 1.97*** (1.20–3.24) | 1.24 (0.75–2.06) | 1.48 (0.88–2.46) |
| Age | 1.13 (0.91–1.40) | 1.24*** (1.09–1.40) | 1.22***(1.06–1.39) | 1.12** (1.00–1.25) | 1.09 (0.96–1.23) |
| Married (vs unmarried) | 0.77 (0.19–3.14) | 0.32** (0.13–0.80) | 0.33** (0.12–0.91) | 0.47 (0.14–1.53) | |
| Marital status (ref = single) | |||||
| Married | 0.74 (0.22–2.54) | ||||
| Cohabitating | 2.22** (1.11–4.44) | ||||
| Locality (ref = urban formal) | |||||
| Urban informal | 1.06 (0.38–2.89) | 1.79* (0.97–3.28) | 1.42 (0.75–2.69) | 1.28 (0.68–2.41) | 1.31 (0.65–2.66) |
| Rural informal | 0.35** (0.13–0.92) | 0.87 (0.50–1.50) | 0.96 (0.52–1.76) | 1.27 (0.76–2.11) | 1.55 (0.92–2.62) |
| Rural formal | 0.80 (0.21–3.03) | 1.03 (0.46–2.33) | 1.64 (0.77–3.52) | 1.48 (0.73–2.98) | 1.55 (0.76–3.15) |
| Employment status (ref = unemployed) | |||||
| Student | 0.47 (0.15–1.46) | 1.47 (0.74–2.90) | 0.60 (0.29–1.25) | 0.46** (0.22–0.94) | 0.40*** (0.20–0.78) |
| Employed | 0.43 (0.15–1.28) | 0.96 (0.40–2.29) | 0.91 (0.38–2.16) | 0.82 (0.42–1.57) | 1.22 (0.56–2.68) |
| Condom used at last sex (vs not used) | 1.03* (0.41–2.58) | 0.97 (0.56–1.68) | 1.24 (0.71–2.18) | 2.06*** (1.32–3.21) | 2.62*** (1.66–4.12) |
| Age of first sex ≤15 (vs 16+) | 0.83 (0.31–2.21) | 1.18 (0.66–2.11) | 1.45 (0.79–2.66) | 1.46 (0.81–2.66) | 1.52 (0.75–3.05) |
| Multiple sexual partners in past year (vs 1 partner) | 2.64* (0.84–8.26) | 2.95*** (1.36–6.40) | 1.49 (0.58–3.82) | 1.66 (0.84–3.30) | |
| Number of lifetime partners (ref = 1 partner) | |||||
| 2 lifetime partners | – | – | – | – | 0.82 (0.43–1.57) |
| 3–4 lifetime partners | – | – | – | – | 1.61 (0.85–3.07) |
| 5+ lifetime partners | – | – | – | – | 1.10 (0.41–3.00) |
| Think partner had MSPs (vs did not think) | – | – | – | – | 1.92** (1.14–3.23) |
| Income last month >R4000 (vs ≤R4000) | – | – | – | – | 0.06*** (0.01–0.45) |
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).