PID during 12-month follow-up, related to demographic characteristics, sexual behaviour and baseline symptoms or co-infection in 2004 women
| Characteristic | % with characteristic | Cases of PID in | Relative risk (95% CI) | Relative risk adjusted for chlamydia (95% CI) | |
|---|---|---|---|---|---|
| Women with characteristic | Women without characteristic | ||||
| Age <20 years | 39.9 | 2.84 (23/810) | 0.75 (9/1194) | 3.77 (1.75 to 8.10) | 3.21 (1.48 to 6.96) |
| Black ethnicity | 24.2 | 2.69 (13/483 | 1.25 (19/1514) | 2.14 (1.07 to 4.3) | 1.81 (0.87 to 3.73) |
| Smoker | 30.4 | 1.81 (11/608) | 1.51 (21/1392) | 1.20 (0.58 to 2.47) | 1.18 (0.57 to 2.44) |
| Further Education college versus university | 26.4 | 3.03 (16/528) | 1.08 (16/1475) | 2.79 (1.41 to 5.55) | 2.63 (1.31 to 5.30) |
| First sexual intercourse <16 years | 28.4 | 1.61 (9/560) | 1.56 (22/1392) | 1.03 (0.48 to 2.23) | 1.02 (0.47 to 13.10) |
| Two or more partners in year prior to baseline* | 42.1 | 2.02 (17/842) | 1.21 (14/1156) | 1.67 (0.83 to 3.36) | 1.60 (0.78 to 3.29) |
| Two or more partners during 12-month follow up | 37.1 | 3.09 (23/744) | 0.71 (9/1260) | 4.33 (2.01 to 9.30) | 3.95 (1.83 to 8.50) |
| New partner during 12-month follow-up | 49.4 | 2.49 (24/965) | 0.79 (8/1007) | 3.07 (1.39 to 6.82) | 2.82 (1.27 to 6.28) |
| Vaginal discharge in the past six months* | 11.3 | 3.59 (8/223) | 1.37 (24/1758) | 2.63 (1.19 to 5.78) | 2.66 (1.22 to 5.82) |
| Pelvic pain* | 12.3 | 4.51 (11/244) | 1.21 (21/1737) | 3.73 (1.82 to 7.64) | 4.07 (2.00 to 8.28) |
| Intermenstrual bleeding* | 12.7 | 2.78 (7/252) | 1.45 (25/1729) | 1.92 (0.84 to 4.40) | 1.90 (0.83 to 4.38) |
| Dyspareunia* | 11.6 | 2.18 (5/229) | 1.54 (27/1752) | 1.42 (0.55 to 3.64) | 1.13 (0.40 to 3.21) |
| Bacterial vaginosis | |||||
| BV positive | 20.5 | 2.94 (11/374) | 1.38 (20/1449) | 2.13 (1.03 to 4.41) | 1.84 (0.88 to 3.88) |
| BV intermediate | 1.4 | 1.2 (1/82) | 1.38 (20/1449) | 0.88 (0.12 to 6.50) | 0.84 (0.11 to 6.24) |
| Chlamydia trachomatis* | 5.7 | 7.02 (8/114) | 1.22 (23/1883) | 5.75 (2.63 to 12.56) | |
| Mycoplasma genitalium* | 3.2 | 5.08 (3/59) | 1.47 (27/1811) | 3.46 (1.08 to 11.09) | 2.90 (0.89 to 9.44) |
| Neisseria gonorrhoeae* | 0.4 | 0 (0/7) | 1.58 (30/1901) | ||
Bold text shows statistically significant relative risk.
*At baseline.
BV, bacterial vaginosis; PID, pelvic inflammatory disease.