General overview of hospital and patient characteristics
| Hospital type | |
| General hospital, n (%) | 14 (45) |
| Teaching hospital, n (%) | 12 (39) |
| University hospital, n (%) | 5 (16) |
| Patient characteristics | |
| Male, n (%) | 60 (55) |
| Median age, years (IQR) | 65.5 (49.0, 74.25) |
| Reason for visit | |
| Outpatient visit, n (%) | 8 (7.4) |
| Outpatient treatment, n (%) | 7 (6.5) |
| Diagnostic test (eg, radiology, laboratory), n (%) | 36 (33.3) |
| Emergency care visit, n (%) | 5 (4.6) |
| Emergency care admission, n (%) | 35 (32.4) |
| Scheduled admission, n (%) | 17 (15.7) |
| Serious adverse event | |
| Median number of cases per hospital (range) | 3 (2–6) |
| Median DEER categories per case (range) | 3 (1–8) |
| Median number of contributing factors (ECM) per case (range) | 4 (1–8) |
| Outcome (disability) | |
| None or N/A, n (%) | 12 (11.0) |
| Minimal, n (%) | 12 (11.0) |
| Transient (1–6 months), n (%) | 18 (16.5) |
| Transient (6–12 months), n (%) | 8 (7.3) |
| Permanent (<50% disability), n (%) | 24 (22.0) |
| Permanent (≥50% disability), n (%) | 1 (0.9) |
| Death, n (%) | 34 (31.2) |
| Medical specialties | |
| General internal medicine, n (%) | 16 (14.7) |
| Cardiology, n (%) | 14 (12.8) |
| Pulmonology, n (%) | 12 (11.0) |
| Surgery, n (%) | 12 (11.0) |
| Gynaecology, n (%) | 10 (9.2) |
| Urology, n (%) | 9 (8.3) |
| Oncology, n (%) | 8 (7.3) |
| Other, n (%) | 28 (25.7) |
DEER, Diagnostic Error Evaluation and Research; ECM, Eindhoven Classification Model.