Study characteristics
| Single seizure group | Epilepsy group | Whole cohort | |
|---|---|---|---|
| Initial cohort | 402 | 389 | 792* |
| Acute symptomatic seizures | 78 | 19 | 97 |
| N after excluding people with acute symptomatic seizures | 324 | 370 | 695 |
| Mortality analyses | |||
| Duration to death in years; median, (IQR) | 3.7 (1.3, 12.9) | 9.0 (3.6, 15.8) | 6.5 (2.0, 14.9) |
| Missing seizure data | 22 | 16 | 38 |
| N after excluding people with missing seizure data | 302 | 354 | 657* |
| Seizure outcome cohort | |||
| Sex male (%) | 140 (46) | 169 (48) | 309 (47) |
| Age at index seizure in years; median (IQR) | 27.0 (12.7, 58.1) | 23.5 (13.9, 55.6) | 24.9 (13.7, 56.9) |
| Age <18 years at index seizure | 118 (39%) | 131 (37%) | 249 (38%) |
| Died during follow-up period (%) | 109 (36) | 113 (32) | 223 (34) |
| Years of follow-up; median (IQR) | 17.0 (10.0, 24.1) | 22.3 (12.1, 24.1) | 17.3 (11.1, 24.1) |
| Years of follow-up in those alive at study end; median (IQR) | 23.7 (22.4, 24.7) | 23.6 (17.2, 24.7) | 23.6 (22.2, 24.7) |
| Presumed aetiology | |||
| Idiopathic/cryptogenic | 230 (76%) | 283 (80%) | 513 (78%) |
| Symptomatic | 72 (24%) | 71 (20%) | 144 (22%) |
*I one person it was not possible to ascertain whether the index seizure was the first.