Characteristics of the study population, values are mean (SD), number (proportion)
| Characteristics of study sample (n=35) | Value |
| Age; years | 79.9 (5.6) |
| Sex | |
| Female | 19 (54%) |
| Male | 16 (46%) |
| Rockwood Clinical Frailty Score | |
| 3 | 1 (2.9%) |
| 4 | 12 (34.3%) |
| 5 | 17 (48.6%) |
| 6 | 5 (14.3%) |
| Surgical specialty | |
| Orthopaedic | 20 (57%) |
| Gastrointestinal | 7 (20%) |
| Urology | 5 (14%) |
| Gynaecology | 1 (3%) |
| Vascular | 1 (3%) |
| Breast | 1 (3%) |
| ASA score* | |
| 2 | 8 (23%) |
| 3 | 27 (77%) |
*ASA, American Society of Anaesthesiologists physical status classification system score.