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Differences in reference sound levels between uncontrolled and controlled groups by frequencies (number of models n=10).
| Frequency (Hz) | Difference between reference sound levels in groups, dB (SD) |
|
| 250 | 1.58 (5.91) | |
| 500 | 2.63 (4.59) | |
| 1k | 4.68 (2.86) | |
| 2k | 2.15 (4.41) | |
| 4k | 0.53 (4.13) | |
| 6k | 0.67 (6.48) | |
| 8k | −1.74 (5.72) |
