Duration of index attack estimated by either a single direct question or a detailed description of symptoms
| Duration of attack (n = 316) | |||
|---|---|---|---|
| Based on single direct question | Based on detailed description of symptoms | ||
| <6 hours | 108 (34%) | 27 (8.5%) | |
| 6–24 hours | 62 (20%) | 38 (12%) | |
| 1–3 days | 73 (23%) | 93 (29%) | |
| ⩾4 days | 73 (23%) | 158 (50%) | |