STI incidence over 12 months, by site
| Overall (N=451) | Cape Town (N=141) | Johannesburg (N=162) | Harare (N=148) | |
| Neisseria gonorrhoeae | ||||
| Events | 51 | 32 | 2 | 17 |
| Person-years | 445.58 | 134.13 | 161.23 | 150.23 |
| Event rate (100 person-years) | 11.4 | 23.9 | 1.2 | 11.3 |
| 95% exact CI for event rate | (8.5, 15.0) | (16.3, 33.7) | (0.2, 4.5) | (6.6, 18.1) |
| Chlamydia trachomatis | ||||
| Events | 123 | 50 | 38 | 35 |
| Person-years | 441.7 | 135.1 | 155.2 | 151.4 |
| Event rate (100 person-years) | 27.8 | 37 | 24.5 | 23.1 |
| 95% exact CI for event rate | (23.1, 33.2) | (27.5, 48.8) | (17.3, 33.6) | (16.1, 32.1) |
| Trichomonas vaginalis | ||||
| Events | 30 | 6 | 7 | 17 |
| Person-years | 448.8 | 138 | 161.2 | 149.6 |
| Event rate (100 person-years) | 6.7 | 4.3 | 4.3 | 11.4 |
| 95% exact CI for event rate | (4.5, 9.5) | (1.6, 9.5) | (1.7, 9.0) | (6.6, 18.2) |
STI, sexually transmitted infection.