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. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: Hear Res. 2009 Dec 3;264(1-2):41–47. doi: 10.1016/j.heares.2009.11.008

Table 1.

Mean pure tone air conduction thresholds (and standard deviations), from 250 – 4000 Hz, in dB HL (re: ANSI, 2004), for the three listener groups.

Listener Group
Frequency Young Norm
 Older Norm
 Older Hrg Imp
250 6.3 (4.4) 9.4 (6.6) 17.9 (8.0)
500 6.3 (3.9) 10.9 (5.5) 23.2 (11.0)
1000 5.7 (5.3) 13.4 (6.2) 27.5 (15.0)
2000 6.3 (5.8) 13.1 (7.3) 39.6 (13.5)
4000 3.0 (4.9) 13.1 (8.5) 58.2 (9.5)