Absolute numbers of chlamydia tests, testing rates and estimated testing rate ratio obtained from the mixed-effects Poisson regression model during and 9 months following the intervention period by study group
| CIRT intervention practices | CIRT control practices | CIRT non-randomised practices | ||||
|---|---|---|---|---|---|---|
| Number of practices | 76 | 81 | 286 | |||
| Number of patients | 66 954 | 79 360 | 287 964 | |||
| Study period | During | 9 m post | During | 9 m post | During | 9 m post |
| Chlamydia screening tests through NCSP | ||||||
| Number in patients 15–24 years | 2 907 | 1 739 | 2379 | 1679 | 7614 | 5.653 |
| Rate of tests/100 patients 15–24 years | 4.34 | 3.46 | 3.00 | 2.82 | 2.66 | 2.63 |
| Estimated testing rate ratio mixed effects Poisson regression (CI) from intention to treat | 1.76 (1.24 to 2.48) | 1.57 (1.07 to 2.30) | Reference | Reference | 0.93 (0.71 to 1.23) | 0.94 (0.69–1.27) |
| Positive tests (chlamydia infections diagnosed) through NCSP screening tests | ||||||
| Number in patients 15–24 years | 164 | 108 | 182 | 118 | 548 | 382 |
| Rate/1000 patients 15–24 years | 2.5 | 2.5 | 2.3 | 2.3 | 1.9 | 2.0 |
| Estimated infections (CI) detected rate ratio mixed-effects Poisson regression from per-protocol analysis | 1.3 (0.9–1.9) 1.4 (1.0–1.9) | 1.4 (0.9–2.3) 1.6 (1.1–2.3) | Reference | Reference | Not in per protocol analysis | Not in per protocol analysis |
CIRT, Chlamydia Intervention Randomised controlled Trial; NCSP, National Chlamydia Screening Programme.