Table 1.
Patient and surgery characteristics.
| Main training data set | Main test data set | Holdout train | Holdout test | |
|---|---|---|---|---|
| Number of cases | 59 926 | 9092 | 1554 | 254 |
| Mean scheduled duration (min) | 125.64 | 128.06 | 90.79 | 89.49 |
| Mean actual duration (min) | 119.53 | 121.65 | 82.21 | 80.31 |
| Unique procedure names | 30 624 | 5655 | 1072 | 214 |
| Number of procedures performed only once | 27 410 | 5058 | 978 | 201 |
| Unique surgeons | 803 | 536 | 72 | 48 |
| Unique anaesthetising locations | 37 | 32 | 1 | 1 |
| Elective cases (%) | 54 914 (92) | 7991 (88) | 1306 (84) | 218 (86) |
| Last cases (%) | 38 079 (64) | 5801 (64) | 843 (54) | 134 (53) |
| Service | ||||
| Gastroenterology | 16 075 | 2424 | 1 | 0 |
| Orthopaedic surgery | 9886 | 1514 | 648 | 106 |
| Ophthalmology | 4649 | 715 | 0 | 0 |
| General surgery | 4355 | 678 | 351 | 56 |
| Otolaryngology | 4082 | 579 | 0 | 0 |
| Urology | 3289 | 496 | 115 | 17 |
| Obstetrics/gynaecology | 3107 | 476 | 344 | 53 |
| Cardiothoracic surgery | 2651 | 383 | 0 | 0 |
| Neurosurgery | 2123 | 360 | 0 | 0 |
| Plastic surgery | 2068 | 306 | 21 | 1 |
| Vascular surgery | 1340 | 204 | 1 | 0 |
| Trauma surgery | 1104 | 180 | 0 | 0 |
| Transplant surgery | 558 | 95 | 0 | 0 |
| Other | 4639 | 682 | 73 | 21 |