Patient characteristics
| Patients | N=141 |
| Age in years, median (IQR) | 79 (64 to 85) |
| Men, n (%) | 55 (39%) |
| Length of stay in days, median (IQR) | 9 (5 to 17) |
| Days of surveillance per patient, median (IQR)* | 4 (2 to 7) |
| Charlson comorbidity index, n (%) | |
| 0 points | 42 (30%) |
| 1–2 points | 64 (45%) |
| 3–4 points | 22 (16%) |
| ≥5 points | 13 (9%) |
| Comorbidity by condition, n (%) | |
| Diabetes mellitus | 33 (23%) |
| Cerebrovascular disease | 28 (20%) |
| Dementia/cognitive impairment | 25 (18%) |
| Heart failure | 20 (14%) |
| Coronary disease | 11 (8%) |
| Chronic obstructive pulmonary disease | 9 (6%) |
| Active cancer | 9 (6%) |
| Peripheral vascular disease | 9 (6%) |
*Surveillance duration was shorter than length of stay because patients were transferred on and off the study ward during their hospitalisation.