Sample demographics
| Total sample | Subsample of patients providing one or more patient incident reports | |
| N | 2471 | 579 |
| Age | ||
| Mean (SD) | 60 (18.3) | 56 (18.0) |
| Median (min, max) | 63 (16–103) | 58 (16–91) |
| Missing, n (%) | 16 (0.6) | 4 (0.7) |
| Gender | ||
| Female, n (%) | 1155 (46.7) | 303 (52.3) |
| Male, (%) | 1289 (52.2) | 272 (47.0) |
| Missing, n (%) | 27 (1.1) | 4 (0.7) |
| Ethnicity, n (%) | ||
| White British | 2295 (93) | 547 (94.5) |
| South Asian | 51 (2) | 8 (1) |
| Other ethnic origin | 101 (4) | 21 (4) |
| Missing | 24 (1) | 3 (0.5) |
| Number of inpatient admissions over the previous 5 years | ||
| Mean (SD) | 2 (5.9) | 3 (8.1) |
| Median (min, max) | 1 (0–100) | 1 (0–100) |
| Time in hospital to date (in days) | ||
| Mean (SD) | 7 (12.0) | 7 (10.2) |
| Median (min, max) | 3 (0–167) | 4 (0–95) |
| Ward specialty | ||
| Surgical specialities/patients recruited (%) | 18 wards, n=1481 (60) | 390 (67) |
| Medical specialities/patients recruited (%) | 15 wards, n=990 (40) | 189 (33) |