Details of the ICU admissions and the subgroups of post-ICU admissions included in the development and validation cohorts
| Development (OUH) | Validation (RBH) | |
| ICU admissions included, n | 8162 | 3421 |
| Age, years | 62 (47–72) (59) | 65 (51–75) (62) |
| Female sex, n | 3381 (41.4%) | 1480 (43.3%) |
| LoS in ICU, days | 1.9 (1.0–4.0) (4.2) | 2.0 (1.0–4.5) (4.2) |
| Outcome | ||
| ICU readmission, n | 543 (6.7%) | 154 (4.5%) |
| Time to ICU readmission, hours | 92 (37–205) (225) | 101 (43–283) (340) |
| In-hospital death, n | 462 (5.7%) | 218 (6.4%) |
| Time to in-hospital death, hours | 296 (84–781) (701) | 204 (66–600) (540) |
| Adverse event, n | 902 (11.1%) | 329 (9.6%) |
| Post-ICU admissions included, n | 273 | 136 |
| Age, year | 64 (51–72) (60) | 66 (55–73) (63) |
| Female sex, n | 85 (31.1) | 61 (45) |
| LoS in ICU, days | 1.9 (1.0–3.9) (3.5) | 1.3 (0.9–3.0) (3.4) |
| Outcome | ||
| ICU readmission, n | 18 (6.6%) | 9 (6.6%) |
| Time to ICU readmission, hours | 162 (73–220) (215) | 108 (72–202) (153) |
| In-hospital death, n | 6 (2.2%) | 4 (2.9%) |
| Time to in-hospital death, hours | 216 (66–514) (356) | 322 (244–365) (288) |
| Adverse event, n | 23 (8.4%) | 11 (8.1%) |
Continuous (numerical) variables are displayed as median (IQR) (mean), and count variables are displayed as counts (%). ‘OUH’ refers to admissions from the Oxford University Hospitals NHS Foundation Trust’s two adult ICUs. ‘RBH’ refers to admissions from the Royal Berkshire NHS Foundation Trust’s single adult ICU.
ICU, intensive care unit; LoS, length of stay.