Timings of spinal anaesthesia delivery dichotomised by predicted surgical duration
| Predicted procedure length | Spinal anaesthesia prior to induction of anaesthesia | Spinal anaesthesia between induction of general anaesthesia and surgical incision) | Spinal anaesthesia after the end of surgery but prior to emergence from anaesthesia | Spinal anaesthesia not used routinely |
| <2–3 hours | 372 (77.7) | 19 (4) | 13 (2.7) | 75 (15.7) |
| >3–4 hours | 355 (74.1) | 20 (4.2) | 23 (4.8) | 81 (16.9) |
Values are frequency (percentage).