Table 2.
Age of hearing onset per diagnosis of all cases (percentage per patient)
| Congenital | Infancy | School-age (5–17 y) | Adult (18–40 y) | Late adult (> 40 y) | Unknown | |
|---|---|---|---|---|---|---|
| Usher | ||||||
| Type 1 | 13 (61.9%) | 4 (30.8%) | ||||
| Type 2 | 5 (23.8%) | 7 (53.8%) | 11 (64.7%) | 5 (26.3%) | 1 (25%) | 3 (75%) |
| Type 4 | 3 (15.8%) | 2 (50%) | ||||
| PHARC | 1 (5.9%) | 4 (21.1%) | ||||
| ADOA plus | 1 (5.9%) | 2 (10.5%) | 1 (25%) | |||
| Cone-rod dystrophy and hearing loss | 1 (7.7%) | 1 (5.9%) | 2 (10.5%) | |||
| Alport syndrome | 1 (7.7%) | 2 (11.8%) | ||||
| MELAS | 2 (10.5%) | |||||
| Heimler syndrome | 2 (9.5%) | |||||
| Senior-Loken syndrome | 1 (5.3%) | |||||
| MIDD | 1 (5.9%) | |||||
| Waardenburg syndrome | 1 (4.8%) | |||||
| Stickler syndrome | 1 (25%) | |||||
| Total | 21 | 13 | 17 | 19 | 4 | 4 |