The 6-month, 1-year and 5-year cumulative risks (CRs) of postoperative de novo epilepsy in neurosurgical patients according to the craniotomy being supratentorial or infratentorial
| Total no. of patients* | Patients with epilepsy | CR 6 months, % (95% CI) | CR 1 year, % (95% CI) | CR 5 years, % (95% CI) | |
| Supratentorial | 4677 | 917 | 9.5 (8.7 to 10.4) | 13.5 (12.6 to 14.6) | 19.6 (18.4 to 20.8) |
| Infratentorial | 355 | 30 | 3.4 (1.9 to 5.9) | 3.7 (2.1 to 6.2) | 7.8 (5.4 to 11.3) |
*Patients in whom it was impossible to distinguish between infratentorial or supratentorial craniotomies from either the procedure or diagnostic code were excluded from this analysis.
†Cumulative risks are the summation of patients alive with epilepsy and deceased with epilepsy.