Variables included in the analysis
| Patient characteristics | |
| Age (years) | <1, 1–4, 5–15 16–29, 30–64, over 65 |
| Sex | Male, female |
| Access to car at time of request | Yes, no |
| Ethnicity | White, non-white |
| Service characteristics | |
| Service | Practice or deputising |
| Type of doctor seen | Practice, GP principal deputy, non principal deputy |
| Delay to visit | Minutes |
| Call type | Daytime, evening, night |
| Care given | |
| Prescription received | Yes, no |
| Outcome of care | |
| Perceived improvement in health | Visual analogue scale (mm) |