Multivariate logistic regression analysis of variables associated with chlamydia infection—subanalysis by ethnicity*
| Variable | OR (95% CI) |
|---|---|
| *Variables in the model: sex, age, marital status, total number of partners, condom use with partners, history of gonorrhoea, history of foreign partner, number of same sex partners, alcohol, history of illicit drug use, occupational group, smoking, number of casual partners. | |
| †Divorced, separated, living together, widowed. | |
| White (n=913) | |
| Total number of partners | |
| 0 | 0.3 (0.03–3.3) |
| 1 | 0.4 (0.3–0.6) |
| 2 | 0.6 (0.4–0.9) |
| Over 2 | 1 |
| No of same sex partners | |
| 1 or more | 0.2 (0.04–0.8) |
| Condom use with all partners | |
| Never | 1 |
| Always | 0.5 (0.3–0.8) |
| Sometimes/often | 0.7 (0.5–0.9) |
| Smoking | |
| None | 11 (1.3–91) |
| 1–5/day | 0.6 (0.5–0.8) |
| Over 5/day | 1 |
| Sex | |
| Male | 1.4 (1.03–1.9) |
| Age group | |
| Under 20 | 1 |
| 20–24 | 0.4 (0.2–0.6) |
| 25–30 | 0.3 (0.2–0.5) |
| Over 30 | 0.2 (0.1–0.3) |
| Black Caribbean (n=316) | |
| No of same sex partners | |
| 1 or more | 2047 (NS) |
| Smoking | |
| None | 1477 (NS) |
| 1–5/day | 1.1 (0.6–1.9) |
| Over 5/day | 1 |
| Alcohol | |
| None | 1 |
| 1–5 units/week | 0.4 (0.2–0.8) |
| >5 units/week | 0.5 (0.2–1.1) |
| Age group | |
| Under 20 | 1 |
| 20–24 | 0.4 (0.2–0.8) |
| 25–30 | 0.4 (0.2–0.8) |
| Over 30 | 0.2 (0.1–0.4) |