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Comparison of average AC gain between the four groups.
| Average AC gain | Group 1 | Group 2 | Group 3 | Group 4 | p |
|---|---|---|---|---|---|
| 500 Hz (DS) | 29.00 dB (12.2) | 27.27 dB (14.78) | 30.79 dB (13.66) | 15.00 dB (7.63) | 0.081 |
| 1000 Hz (DS) | 26.00 dB (8.76) | 25.98 dB (13.5) | 24.95 dB (14.37) | 15.32 dB (7.24) | 0.201 |
| 2000 Hz (DS) | 20.00 dB (10.02) | 21.14 dB (13.23) | 22.37 dB (9.33) | 10.00 dB (8.2) | 0.121 |
| 4000 Hz (DS) | 17.45 dB (8.64) | 21.74 dB (13.9) | 21.84 dB (9.45) | 7.14 dB (2.67) | 0.061 |
SD: Standard deviation.
