STD incidence at follow up visits, cohort of sex workers, Guangzhou, China, March 1998–October 1999
| Gonorrhoea | Trichomoniasis | Chlamydia | ||||
|---|---|---|---|---|---|---|
| Visit | IR (100PY) | RR (95% CI) | IR (100PY) | RR (95% CI) | IR (100PY) | RR (95% (CI) |
| IR = incidence rate, RR = relative risk, PY = person year, CI = confidence interval. | ||||||
| *Indicating the trends by using GEE. | ||||||
| First follow up | 17.48 | 1 | 22.35 | 1 | 65.91 | 1 |
| Second follow up | 6.74 | 0.39 (0.18 to 0.84) | 8.43 | 0.38 (0.19 to 0.75) | 58.20 | 0.88 (0.66 to 1.18) |
| Third follow up | 5.10 | 0.29 (0.11 to 0.75) | 3.03 | 0.14 (0.04 to 0.45) | 16.05 | 0.24 (0.14 to 0.41) |
| p Value for trend* | 0.004 | <0.001 | <0.001 | |||