Table 1.
Information about personal details, history, and VOR-gain abnormalities for overall 59 cases with pDBN and different subgroups divided according to the vertical semicircular canal involved by BPPV.
| Affected semicircular canal (% of overall) | Sex | Age (y) | Previous BPPV | Previous head trauma (%) | VOR-gain abnormalities (%) | ||
|---|---|---|---|---|---|---|---|
| M (%) | F (%) | Defined (%) | Undefined (%) | ||||
| Overall, n. 59 (100) | 21 (35.6) | 38 (64.4) | 57 ± 13.9 | 33 (55.9) | 13 (22) | 10 (16.9) | 43 (72.9) |
| PSC, n. 46 (78) | 16 (34.8) | 30 (65.2) | 57.9 ± 14.4 | 26 (56.5) | 10 (21.7) | 6 (13) | 37 (80.4) |
| ASC, n. 7 (11.9) | 2 (28.6) | 5 (71.4) | 59.7 ± 11.8 | 6 (85.7) | 0 (0) | 2 (28.6) | 6 (85.7) |
| Unidentified, n. 6 (10.1) | 3 (50) | 3 (50) | 47.3 ± 8.2 | 1 (16.7) | 3 (50%) | 2 (33.3) | 0 (0) |
ASC, anterior semicircular canal; BPPV, benign paroxysmal positional vertigo; F, female; M, male; pDBN, positional downbeat nystagmus; PSC, posterior semicircular canal; VOR, vestibulo-ocular reflex; y, years.