Incidence rates of HIV, gonorrhoea, chlamydia and trichomoniasis per site, and overall
| STI | All sites (n=3087) | Blantyre, Malawi (n=441) | Lilongwe, Malawi (n=596) | Durban, South Africa (n=702) | Hlabisa, South Africa (n=346) | Philadelphia, USA (n=200) | Lusaka, Zambia (n=319) | Chitungwiza, Zimbabwe (n=260) | Harare, Zimbabwe (n=223) |
|---|---|---|---|---|---|---|---|---|---|
| HIV | |||||||||
| Number seroconversions | 194 | 26 | 16 | 57 | 58 | 2 | 18 | 9 | 8 |
| IR* (95% CI) | 3.7 (3.2 to 4.2) | 3.7 (2.4 to 5.4) | 1.4 (0.8 to 2.3) | 4.6 (3.5 to 6.0) | 9.1 (6.9 to 11.8) | 0.5 (0.1 to 1.7) | 4.1 (2.4 to 6.5) | 2.5 (1.1 to 4.6) | 2.5 (1.1 to 4.9) |
| Gonorrhoea | |||||||||
| Number with ≥1 infection | 76 | 12 | 12 | 22 | 17 | 1 | 5 | 6 | 1 |
| Total number infections | 82 | 15 | 12 | 24 | 18 | 1 | 5 | 6 | 1 |
| IR* (95% CI) | 1.6 (1.2 to 2.0) | 2.2 (0.6 to 3.7) | 1.1 (0.5 to 1.7) | 2.0 (1.2 to 2.9) | 3.0 (1.4 to 4.6) | 0.2 (-0.3 to 0.8) | 1.2 (0.2 to 2.2) | 1.7 (0.4 to 3.0) | 0.3 (0.0 to 1.0) |
| Chlamydia | |||||||||
| Number with ≥1 infection | 180 | 9 | 10 | 71 | 54 | 10 | 9 | 10 | 7 |
| Total number infections | 198 | 10 | 12 | 76 | 62 | 12 | 9 | 10 | 7 |
| IR* (95% CI) | 3.9 (3.3 to 4.4) | 1.4 (0.5 to 2.4) | 1.1 (0.3 to 1.8) | 6.4 (4.9 to 7.9) | 10.3 (7.6 to 13.0) | 2.9 (1.1 to 4.7) | 2.1 (0.8 to 3.4) | 2.8 (1.1 to 4.5) | 2.2 (0.6 to 3.8) |
| Trichomoniasis | |||||||||
| Number with ≥1 infection | 521 | 59 | 138 | 66 | 126 | 63 | 30 | 19 | 20 |
| Total number infections | 792 | 83 | 224 | 93 | 208 | 106 | 33 | 24 | 21 |
| IR* (95% CI) | 15.3 (13.9 to 16.7) | 12.0 (8.6 to 15.4) | 20.1 (16.3 to 23.8) | 7.7 (5.7 to 9.6) | 33.6 (28.0 to 39.1) | 25.7 (18.9 to 32.5) | 7.6 (4.7 to 10.4) | 6.5 (3.3 to 9.7) | 6.6 (3.6 to 9.6) |
*Incidence rate (per 100 person-years follow-up).
STI, sexually transmitted infection.