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Mean pure tone thresholds (and standard deviations) for the three listener groups, from 250 to 4000 Hz, in dB HL.
| Frequency (Hz) | |||||
|---|---|---|---|---|---|
| 250 | 500 | 1000 | 2000 | 4000 | |
| Yng Norm | 6.3 (4.4) | 6.3 (3.9) | 5.6 (5.3) | 6.3 (5.8) | 3.0 (4.9) |
| Older Norm | 9.4 (6.6) | 10.9 (5.5) | 13.4 (6.2) | 13.1 (7.3) | 13.1 (8.5) |
| Older Hrg Imp | 17.8 (8.0) | 23.2 (11.0) | 27.5 (15.0) | 39.6 (13.5) | 49.2 (9.5) |
