Table 1.
Pure tone thresholds in dB HL (re: ANSI 2004) in the test ear of the four listener groups (n=15∕group). Data shown are group means, with standard deviations in parentheses
| Frequency (Hz) | |||||
|---|---|---|---|---|---|
| Group | 250 | 500 | 1000 | 2000 | 4000 |
| Young normal | 7.6 (4.9) | 7.0 (4.9) | 5.0 (4.2) | 3.3 (8.2) | 1.0 (6.6) |
| Young noise masked | 11.0 (4.3) | 13.3 (3.1) | 15.3 (4.0) | 18.7 (4.0) | 20.3 (4.0) |
| Older normal | 15.3 (5.7) | 15.3 (5.3) | 14.6 (6.3) | 17.8 (8.0) | 18.9 (6.2) |
| Older hearing impaired | 25.0 (9.6) | 24.7 (10.3) | 27.7 (10.7) | 40.7 (10.0) | 51.7 (7.7) |