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Hearing threshold of subjects and controls
| HT | Subjects | Controls | χ 2 | P value | ||
|---|---|---|---|---|---|---|
| Freq | Percent | Freq | Percent | |||
| NHT (≤25 dB) | 224 | 82.4 | 252 | 92.6 | 13.176 | <0.0001 |
| AHT (>25 dB) | 48 | 17.6 | 20 | 7.4 | ||
| Total | 272 | 100 | 272 | 100 | ||
Freq: frequency, NHT: normal hearing threshold, AHT: abnormal hearing threshold
