Duration of non-driving required for a private motor vehicle following first seizure (subdivided according to aetiology) using varying acceptable risks of seizure recurrence
| Time needed off the road (months) for conditional rate of seizure recurrence to fall to: | |||
|---|---|---|---|
| 1.7% per month | 2.5% per month | 3.1% per month | |
| Equivalent monthly risk of a seizure while driving* | 0.69 per 1000 (1 in 1442) | 1.04 per 1000 (1 in 964) | 1.3 per 1000 (1 in 771) |
| Equivalent ARR† | ARR 2.0 | ARR 2.6 | ARR 3.0 |
| All patients (months) | 8 | 7 | 5 |
| Unprovoked all (months) | 13 | 8 | 7 |
| Remote symptomatic | 17 | 10 | 7 |
| Idiopathic | 12 | 8 | 7 |
| Provoked (months) | 6 | 5 | 4 |
*Calculated by multiplying chance of a seizure by the proportion of time spent driving (the above results are for an average driving time of 1 h/day).
†For a driving time of 1 h/day; a 60% chance of a seizure behind the wheel causing an accident, 3% fatal; and overall community fatal accident per driver/year of 1 in 7000.
ARR, accident risk ratio.