Outcome measures of patient safety at the patient and practice level
| Outcome | Theoretical range of scale | Patient scores | Aggregated practice scores | ||||
| n | Mean (SD) | Range | N | Mean (SD) | Range | ||
| Experiences of safety problems | 0 (worst)−100 (best) | 1171 | 95.19 (9.40) | 27.8–100 | 45 | 94.88 (2.58) | 86.82–99.44 |
| Harm | 0 (worst)−100 (best) | 1084 | 94.95 (18.88) | 0–100 | 45 | 94.52 (4.84) | 71–100 |
| Overall perceptions of patient safety | 0 (worst)−100 (best) | 1139 | 86.01 (16.77) | 0–100 | 45 | 85.36 (5.73) | 64–94.41 |
n, number of participating patients; N, number of participating practices; SD, standard deviation.