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Table 3 Probability (Pr) of positive test result by previous test result and age group among women according to reason for testing and men, 2008–2014

From: Not again! Effect of previous test results, age group and reason for testing on (re-)infection with Chlamydia trachomatis in Germany

Previous test result Age group, years Pr to test positive in % (99%-CI)
Women Men
Screening under 25 years Screening in pregnancy Diagnostic testing All tests
Negative 15–19 4.3 (4.1–4.6) 6.5 (6.0–8.1) 5.3 (4.8–5.8) 9.2 (5.9–14.1)
20–24 3.4 (3.2–3.5) 3.0 (2.9–3.4) 4.6 (4.3–4.9) 10.7 (9.0–12.6)
25–29 1.1 (1.0–1.3) 3.1 (2.9–3.4) 9.5 (8.0–11.2)
30–34 0.4 (0.4–0.5) 1.6 (1.4–1.9) 7.8 (6.5–9.3)
35–39 0.3 (0.2–0.4) 1.2 (1.0–1.5) 6.4 (5.2–7.9)
40+ 0.3 (0.1–0.6) 1.1 (0.9–1.3) 5.5 (4.8–6.3)
Positive 15–19 12.6 (11.3–14.0) 28.4 (34.3–45.7) 16.8 (15.7–18.1) 18.6 (12.7–26.4)
20–24 9.8 (9.1–10.4) 18.5 (20.6–24.9) 12.7 (12.0–13.4) 19.2 (16.7–22.0)
25–29 10.4 (10.0–13.3 10.1 (9.2–11.0) 16.6 (14.3–19.3)
30–34 7.9 (6.8–10.8) 7.1 (6.0–8.4) 16.4 (13.8–19.5)
35–39 6.4 (4.3–10.7) 8.8 (6.9–11.0) 15.4 (12.3–19.1)
40+ 5.9 (2.3–17.2) 5.9 (4.3–8.1) 16.9 (14.7–19.4)
Unknown 15–19 4.9 (4.7–5.0) 9.7 (10.2–11.3) 8.1 (7.7–8.4) 16.9 (15.7–18.2)
20–24 5.7 (5.6–5.8) 5.8 (6.0–6.4) 8.3 (8.0–8.6) 22.3 (21.6–23.1)
25–29 2.2 (2.1–2.3) 5.1 (5.0–5.3) 18.0 (17.3–18.7)
30–34 1.1 (1.0–1.1) 2.9 (2.7–3.0) 12.4 (11.8–13.1)
35–39 0.7 (0.6–0.8) 1.9 (1.8–2.1) 9.4 (8.8–10.1)
40+ 0.6 (0.5–0.8) 1.6 (1.5–1.7) 6.1 (5.8–6.4)