Multivariate logistic regression analysis of variables associated with chlamydia infection*
| Variable | Odds ratio (95% CI) |
|---|---|
| *Variables in the model: sex, age, marital status, ethnic group, 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. | |
| †Divorced, separated, living together, widowed. | |
| Sex | |
| Male | 1.3 (1.02–1.7) |
| Age group | |
| Under 20 | 1 |
| 20–24 | 0.4 (0.3–0.6) |
| 25–30 | 0.4 (0.3–0.6) |
| Over 30 | 0.2 (0.2–0.4) |
| Total number of partners | |
| 0 | 0.1 (0.02–1.05) |
| 1 | 0.4 (0.3–0.6) |
| 2 | 0.7 (0.5–0.9) |
| Over 2 | 1 |
| Condom use with all partners | |
| Never | 1 |
| Always | 0.4 (0.3–0.7) |
| Sometimes/often | 0.8 (0.6–1.1) |
| Smoking | |
| None | 17 (1.3–133) |
| 1–5/day | 0.7 (0.6–0.9) |
| Over 5/day | 1 |
| Marital status | |
| Single | 1.8 (1.1–3.1) |
| Married | 1 |
| Other† | 0.7 (0.3–1.6) |
| Ethnic group | |
| White | 1 |
| Black Caribbean | 2 (1.5–2.7) |
| Other | 1.2 (0.9–1.9) |