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Pure-tone audiometry thresholds among study participants.
| Hearing loss (dB HL) | Number of ears | ||||||
| 250 Hz | 500 Hz | 1 kHz | 2 kHz | 4 kHz | 6 kHz | 8 kHz | |
| 15 and less | 108 | 108 | 118 | 118 | 110 | 87 | 93 |
| 16-25 | 14 | 16 | 11 | 12 | 12 | 22 | 15 |
| 26-40 | 11 | 11 | 8 | 8 | 7 | 15 | 13 |
| 41-60 | 6 | 4 | 2 | 0 | 4 | 7 | 8 |
| 60-80 | 0 | 0 | 0 | 1 | 5 | 5 | 5 |
| Over 80 | 1 | 1 | 1 | 1 | 2 | 4 | 6 |
