Demographic data of the participating practices
| Practice no | Patient list size* | GPs (n) | Area | Training practice (yes/no) | |
| Partners | Other | ||||
| 1 | 2100 | 1 | – | Semirural | No |
| 2 | 4300 | 3 | 1 salaried | Urban | Yes |
| 3 | 3200 | 1 | 1 salaried 1 long-term locum | Urban | No |
| 4 | 4100 | 3 | 1 retainer | Urban | Yes |
| 5 | 11 000 | 8 | – | Semirural | Yes |
| 6 | 5900 | 4 | 1 salaried | Urban | Yes |
| 7 | 8200 | 7 | – | Urban | Yes |
| 8 | 6800 | 3 | 2 salaried | Urban | Yes |
| 9 | 6400 | 3 | 1 salaried | Urban | No |
| 10 | 9900 | 6 | 1 retainer | Urban | Yes |
| 11 | 3000 | 4 | 1 retainer | Urban | Yes |
| 12 | 7500 | 6 | 1 salaried | Urban | Yes |
*Rounded to the nearest hundred at the beginning of the study period.
GPs, general practitioners.