Associations between STIs and HIV incidence rate
| Participants, n (%) | Total PY | HIV infections (n) | Incidence rate (per 100 PY) | 95% CI | |
| Rectal CT/GC or syphilis (key STI) | 101 (39.4) | 87.0 | 15 | 17.2 | 9.7 to 28.5 |
| Syphilis | 30 (11.7) | 24.0 | 5 | 20.8 | 6.8 to 48.6 |
| Rectal CT/GC | 83 (32.4) | 72.9 | 12 | 16.5 | 8.5 to 28.8 |
| Rectal CT | 56 (21.9) | 49.8 | 8 | 16.1 | 6.9 to 31.6 |
| Rectal GC | 62 (24.2) | 54.0 | 8 | 14.8 | 6.4 to 29.2 |
| Excluding participants reporting rectal infection or syphilis | |||||
| Pharyngeal infection | 25 (16.1) | 23.5 | 0 | 0 | 0 to 15.7* |
| Urethral infection | 33 (21.3) | 30.6 | 1 | 3.3 | 0.08 to 18.2 |
*One sided, 97.5% CI.
GC, gonorrhoea CT, chlamydia; PY, person-years.