Weighted numbers of Ct IgG positives and weighted Ct IgG seroprevalence in the general population in the Netherlands in 1996, 2007 and 2017
| Overall | 1996 | 2007 | 2017 | χ² test between rounds* | |||
| CAT+N; % (95% CI) | CAT+N; % (95% CI) | CAT+N; % (95% CI) | CAT+N; % (95% CI) | 1996 vs 2007 (p value) | 2007 vs 2017 (p value) | 1996 vs 2017 (p value) | |
| Women | |||||||
| Overall | 225; 10.5 (9.2 to 12.0) | 92; 12.3 (9.9 to 15.0) | 61; 8.8 (7.0 to 11.0) | 70; 10.3 (7.9 to 13.0) | <0.05 | 0.37 | 0.29 |
| 15–24 years | 59; 7.5 (5.7 to 9.6)** | 15; 5.9 (3.7 to 9.2)*** | 19; 7.6 (5.1 to 11.1) | 24; 8.8 (5.5 to 13.9) | 0.40 | 0.62 | 0.23 |
| 25–39 years | 166; 12.2 (10.4 to 14.3)** | 77; 15.6 (12.2 to 19.7%)*** | 42; 9.5 (7.2 to 12.4) | 46; 11.2 (8.1 to 15.3) | <0.01 | 0.42 | 0.10 |
| Men | |||||||
| Overall | 126; 5.8 (4.7 to 7.0) | 34; 4.5 (3.1 to 6.0) | 51; 7.1 (4.9 to 10.0) | 40; 6.0 (4.2 to 8.0) | 0.08 | 0.50 | 0.28 |
| 15–24 years | 44; 5.5 (3.9 to 7.7) | 11; 4.4 (2.4 to 7.7) | 20; 7.4 (4.2 to 13.0) | 12; 5.0 (2.5 to 8.9) | 0.20 | 0.29 | 0.86 |
| 25–39 years | 82; 6.0 (4.6 to 7.8) | 23; 4.5 (2.8 to 7.2) | 31; 6.9 (4.4 to 10.7) | 28; 6.7 (4.4 to 10.3) | 0.21 | 0.96 | 0.23 |
Weighted number of study participants for each group can be found in online supplemental table 2. Please note that these numbers are weighted and do not necessarily correspond to the numbers in table 1.
P values of <0.05 are indicated in bold. P values for χ² test between age groups by study round are indicated as: *p<0.05, **p<0.01, ***p<0.001.
*P value for χ² test for a linear trend in proportions between study rounds by age group.
CAT, chlamydia antibody test; Ct, Chlamydia trachomatis.