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The average of the ABG was calculated on different respective frequency, from 500 to 4,000 Hz. We used the mean threshold of four frequencies at least within this range; and assumed that a better value is used if the authors did not supply their calculation.
| Frequencies (kHz) | ABG average |
|---|---|
| 0.5, 1, 2, 3 | 4ABG |
| 0.5, 1, 2, 4 | 4ABG |
| 0.5, 1, 2, (2 + 4):2 | 5ABG |
