| Clinical features | % |
|---|---|
| Vestibular symptoms | |
| Rotational vertigo | 70 |
| Other illusiory self or object motion | 18 |
| Positional vertigo | 42 |
| Head motion intolerance | 48 |
| Duration of vestibular symptoms | |
| Seconds to 5 minutes | 18 |
| 5 to 60 minutes | 33 |
| 1 hour to 1 day | 21 |
| >1 day | 28 |
| Migrainous symptoms during vertigo | |
| Migrainous headache | 94 |
| Always | 46 |
| Sometimes | 48 |
| No headache | 6 |
| Photophobia | 70 |
| Phonophobia | 64 |
| Visual or other auras | 36 |