Quality assessment of studies
| Quality criteria | Categories | Number of studies (% of relevant studies) |
|---|---|---|
| Type of study (n=90) | Simple descriptive | 34 (37) |
| Pre-feedback data from audit studies | 46 (50) | |
| Control data from experimental studies | 12 (13) | |
| Sampling of practices (n=90) | Self-selected | 60 (67) |
| Random | 16 (18) | |
| All | 5 (6) | |
| Not stated | 9 (9) | |
| Number of practices (n=90) | 1 | 18 (20) |
| 2–6 | 15 (17) | |
| 7+ | 52 (58) | |
| Not stated | 5 (5) | |
| Number of patients (n=89) | <50 | 6 (7) |
| 50–100 | 10 (11) | |
| 101–500 | 29 (32) | |
| >500 | 40 (46) | |
| Not stated | 4 (4) | |
| Not applicable | 1 | |
| Response rate of Gps (n=57) | <25% | 3 (5) |
| 25–50% | 7 (12) | |
| 51–75% | 11 (19) | |
| 76–100% | 16 (27) | |
| Not stated | 22 (37) | |
| Not applicable | 33 |