Prediction rule for quantifying the probability of C trachomatis infection
| Predictor | Score | |
|---|---|---|
| Women | Men | |
| *Women, (post)coital bleeding previous 4 weeks; men, frequent urination previous 4 weeks. | ||
| An estimate of the probability of C trachomatis infection can be calculated using the formula p(Ct) = 1/1+exp (– LPS), where LPS = −7.26+0.47×score. | ||
| Age group (years) | ||
| 15–19 | 1 | 1 |
| 20–24 | 0 | 0 |
| 25–29 | 0 | 0 |
| AAD | ||
| Rural (AAD 5) | 0 | 0 |
| Low/moderate/high urban (AAD 2–4) | 2 | 2 |
| Very high urban (AAD 1) | 3 | 3 |
| Ethnicity | ||
| Dutch or other | 0 | 0 |
| Surinam or Antillian | 2 | 2 |
| Education | ||
| Low or intermediate | 2 | 2 |
| High | 0 | 0 |
| Urogenital symptoms* | 1 | 2 |
| Lifetime sexual partners | ||
| 1 | 0 | 0 |
| 2–5 | 3 | 2 |
| ⩾6 | 5 | 3 |
| New partner previous 2 months | 1 | 1 |
| No condom last sexual contact | 1 | 1 |