Time (in minutes) across expected length of operation, observed length of operation, and the deviation from across the 10 specialties
| Specialty | n (%) | Expected Length | Observed Length | Deviation from Expected Length | |||
| Mean | SD | Mean | SD | Mean | SD | ||
| Cardiac | 10 (6.3) | 189.0 | 55.7 | 249.0 | 131.1 | 72.0 | 110.1 |
| Ophthalmology | 20 (12.5) | 24.0 | 12.3 | 30.7 | 30.0 | 7.5 | 14.7 |
| ENT | 18 (11.2) | 55.0 | 45.7 | 108.3 | 226.3 | 53.3 | 204.8 |
| General surgery | 20 (12.5) | 47.7 | 25.3 | 55.2 | 42.4 | 7.5 | 29.1 |
| Facio-maxillary | 14 (8.7) | 46.0 | 28.2 | 40.7 | 20.7 | −3.2 | 30.4 |
| Neuro-surgery | 12 (7.6) | 58.3 | 24.8 | 132.5 | 85.7 | 70.6 | 81.2 |
| Orthopaedic | 18 (11.2) | 79.1 | 57.9 | 90.8 | 71.9 | 10.5 | 46.0 |
| Vascular | 12 (7.6) | 92.5 | 53.4 | 125.8 | 115.7 | 30.0 | 95.6 |
| Urology | 18 (11.2) | 62.5 | 64.3 | 51.6 | 72.0 | −7.5 | 31.1 |
| Plastics | 18 (11.2) | 48.1 | 35.4 | 68.2 | 57.0 | 20.6 | 29.9 |