Sociodemographics and sexual risk behaviour by data collection methods
| Variables | Data collection 1 (self-completion) n=291 (%) | Data collection 2 (completion with support) n=205 (%) | P value |
| Age (years), median (IQR) | 26 (22–29) | 24 (21–28) | 0.134 |
| 18–24 | 117 (40.2) | 113 (55.1) | |
| 25–29 | 90 (30.9) | 47 (22.9) | |
| ≥30 | 68 (23.4) | 45 (22.0) | |
| Missing | 16 (5.4) | – | |
| Gender | 0.145 | ||
| Male | 92 (31.6) | 57 (27.8) | |
| Female | 195 (67.0) | 148 (72.2) | |
| Missing | 4 (1.4) | – | |
| Employment status | <0.001 | ||
| Not employed | 185 (63.6) | 104 (50.7) | |
| Employed | 86 (29.6) | 46 (22.4) | |
| Student | 17 (5.8) | 55 (26.8) | |
| Missing | 3 (1.0) | – | |
| Ever had sex under the influence of alcohol or drugs | 0.993 | ||
| Yes | 95 (32.6) | 67 (32.7) | |
| No | 196 (67.4) | 138 (67.3) | |
| Condomless sex in the last year | <0.001 | ||
| Yes | 190 (65.3) | 166 (81.0) | |
| No | 101 (34.7) | 39 (19.0) | |
| Current STI symptoms | 0.534 | ||
| Yes | 62 (21.3) | 39 (19.0) | |
| No | 229 (78.7) | 166 (81.0) | |
| Previous STI treatment | 0.923 | ||
| Yes | 84 (28.9) | 60 (29.3) | |
| No | 207 (71.1) | 145 (70.7) | |
| Current sexual partners | 0.174 | ||
| 0 | 56 (19.2) | 25 (8.6) | |
| 1 | 209 (71.8) | 156 (76.1) | |
| 2–4 | 22 (7.6) | 21 (10.2) | |
| >4 | 4 (1.4) | 3 (1.5) | |
| Clinic used for care | <0.001 | ||
| Tshwane: urban | 63 (21.6) | 131 (63.9) | |
| Nelson Mandela Bay: periurban | 67 (23.0) | 73 (35.6) | |
| Outside study clinics | 161 (55.3) | – | |
| Missing | 0 | 1 (0.4) |