Stepwise forward logistic regression using ethnic groups, sex, age groups, and socioeconomic status based on the Super Profile of the place of residence. Controls were patients who attended the STD clinic with no infection. Gonorrhoea and chlamydia infected patients were compared with controls. Odds ratio with 95% confidence intervals
| Factor | Grouping | Chlamydia OR (95% CI) | Gonorrhoea OR (95% CI) |
|---|---|---|---|
| Sex | Male | 1 | 1 |
| Female | 0.5 (0.4–0.6) | 0.7 (0.5–0.9) | |
| Age group | <20 | 1 | 1 |
| 20–29 | 0.4 (0.3–0.6) | 0.3 (0.2–0.5) | |
| 30–39 | 0.2 (0.16–0.35) | 0.2 (0.1–0.3) | |
| > 40 | 0.1 (0.04–0.14) | 0.07 (0.04–0.14) | |
| Ethnic groups | White | 1 | 1 |
| Black | 2.4 (1.9–3.2) | 1.5 (1.1–2.1) | |
| Asian | 0.8 (0.5–1.3) | 0.5 (0.2–0.9) | |
| Other | 30.9 (7–135) | 22.6 (5–104) | |
| Super Profile | E | 1 | 1 |
| A | 0.7 (0.3–1.5) | 0.7 (0.3–1.7) | |
| B | 1.3 (0.7–2.5) | 0.9 (0.4–1.8) | |
| C | 1.4 (0.8–2.4) | 0.3 (0.1–0.8) | |
| D | 1.3 (0.8–2.1) | 0.5 (0.3–0.97) | |
| F | 2.9 (0.2–36) | 0.6 (0.03–9) | |
| G | 1.5 (0.9–2.6) | 0.8 (0.4–1.5) | |
| H | 1.8 (1.2–2.9) | 1.0 (0.6–1.7) | |
| I | 1.1 (0.7–1.7) | 0.7 (0.4–1.2) | |
| J | 1.7 (1.2–2.4) | 1.5 (1.1–2.1) |