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Proportions of types of hearing loss in Research Groups I and II.
| PTA | RGI (%) | RGII (%) |
| CHL/MHL+SNHL | 0.0 | 15.4 |
| CHL | 20.0 | 30.8 |
| SNHL | 0.0 | 38.5 |
| HFSNHL | 80.0 | 15.4 |
| Total | 100.0 | 100.0 |
PTA: pure-tone audiometry, CHL: conductive hearing loss; MHL: mixed hearing loss; SNHL: sensorineural hearing loss; HFSNHL: high-frequency sensorineural hearing loss.
