Table 2.
Baseline characteristics of 48,039 elective and 143,275 emergency admissions between 01 February 2017 to 31 January 2020 used in training and testing discharge prediction models
| Elective (N = 48,039) | Emergency (N = 143,275) | Total (N = 191,314) | |||
|---|---|---|---|---|---|
| Training (N = 32,832) | Test (N = 15,207) | Training (N = 92,611) | Test (N = 50,664) | ||
| Age (years) | |||||
| Median (Q1, Q3) | 62.0 (48.0, 73.0) | 62.0 (48.0, 73.0) | 67.0 (47.0, 81.0) | 66.0 (46.0, 81.0) | 65.0 (47.0, 79.0) |
| Sex | |||||
| Female | 16,409 (50.0%) | 7603 (50.0%) | 47,790 (51.6%) | 26,067 (51.5%) | 97,869 (51.2%) |
| Male | 16,423 (50.0%) | 7604 (50.0%) | 44,821 (48.4%) | 24,597 (48.5%) | 93,445 (48.8%) |
| Ethnicity | |||||
| White | 23,977 (73.0%) | 10,961 (72.1%) | 73,611 (79.5%) | 39,511 (78.0%) | 148,060 (77.4%) |
| Mixed | 173 (0.5%) | 92 (0.6%) | 627 (0.7%) | 390 (0.8%) | 1282 (0.7%) |
| Asian | 712 (2.2%) | 402 (2.6%) | 2198 (2.4%) | 1264 (2.5%) | 4576 (2.4%) |
| Black | 355 (1.1%) | 185 (1.2%) | 1040 (1.1%) | 566 (1.1%) | 2146 (1.1%) |
| Other | 271 (0.8%) | 155 (1.0%) | 792 (0.9%) | 406 (0.8%) | 1624 (0.8%) |
| Unknown | 7344 (22.4%) | 3412 (22.4%) | 14,343 (15.5%) | 8527 (16.8%) | 33,626 (17.6%) |
| IMD deprivation score | |||||
| Median (Q1, Q3) | 9.8 (5.9, 15.5) | 9.9 (6.2, 15.8) | 10.5 (6.2, 16.5) | 10.3 (6.5, 16.3) | 10.2 (6.2, 16.1) |
| Missing | 525 | 212 | 1122 | 555 | 2414 |
| Admission source | |||||
| Usual place of residence | 32,232 (98.2%) | 14,959 (98.5%) | 87,493 (94.6%) | 48,212 (95.4%) | 182,896 (95.7%) |
| Other hospital provider | 487 (1.5%) | 196 (1.3%) | 4210 (4.6%) | 2023 (4.0%) | 6916 (3.6%) |
| Other | 92 (0.3%) | 36 (0.2%) | 758 (0.8%) | 324 (0.6%) | 1210 (0.6%) |
| Missing | 21 | 16 | 150 | 105 | 292 |
| Length of stay (days) | |||||
| Median (Q1, Q3) | 2.2 (1.2, 5.1) | 2.2 (1.2, 4.9) | 2.1 (0.9, 6.1) | 2.0 (0.8, 5.7) | 2.1 (1.0, 5.6) |
IMD: Index of multiple deprivation (higher scores indicate greater deprivation, range 0–73.5).