Baseline data table for GP practices (April 2009–March 2010)
| CIRT practices* intervention | CIRT control practices | CIRT non-randomised practices | |
|---|---|---|---|
| Number of GP practices | 77 | 83 | 308 |
| GP practice size | |||
| Under 5516 | 35% | 33% | 32% |
| 5516–9377 | 36% | 32% | 32% |
| Over 9377 | 29% | 35% | 36% |
| Number of patients 15–24 years in GP practices | |||
| Under 625 | 34% | 36% | 30% |
| 625–1100 | 38% | 27% | 34% |
| Over 1100 | 28% | 37% | 36% |
| Distribution of practices by deprivation score quintile | |||
| 1 (highest) | 3 (4%) | 3 (4%) | 5 (2%) |
| 2 | 14 (19%) | 17 (21%) | 62 (22%) |
| 3 | 27 (36%) | 27 (33%) | 93 (33%) |
| 4 | 28 (38%) | 30 (37%) | 118 (41%) |
| 5 (lowest) | 2 (3%) | 4 (5%) | 8 (3%) |
| % male GPs | 52% | 51% | Not measured |
| % training practices | 42% | 54% | Not measured |
| % of all GP Chlamydia tests over the 3 years of data collection (number of tests) | 14% (6613) | 14% (6580) | 46% (21 305) |
| Screening test rates in year preintervention/100 registered 15–24-year-old patients (IRR, CI) | 2.43 (1.01, 0.66 to 1.56) | 2.61 (Reference) | 2.29 (0.86, 0.61 to 1.21) |
| Positive screens in year preintervention/1000 registered 15–24-year-old patients (IRR, CI) | 2.08 (1.03, 0.66 to 1.61) | 2.03 (Reference) | 1.70 (0.88, 0.62 to 1.25) |
*% of practices total allocated to intervention from each PCT: BANES 5%, Bristol 16%. Cornwall 12%, Devon 15%, Gloucestershire 9%, North Somerset 5%, Plymouth 11%, Somerset 12%, South Gloucestershire 5%, Swindon 5%, Wiltshire 5%. CIRT, Chlamydia Intervention Randomised controlled Trial; GP, general practitioner; IRR, incidence rates ratio; PCT, Primary Care Trust.