audiometric zero

audiometric zero

A value arbitrarily assigned to 0 dB (deciBel) hearing level, the average hearing acuity for a normal population, which corresponds to 24.5 dB sound pressure level (SPL) at 250 Hertz.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

audiometric zero

Audiology A value arbitrarily assigned to 0 dB–deciBel hearing level, the average hearing acuity for a normal population, which corresponds to 24.5 dB SPL–sound pressure level at 250 Hertz
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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The next criterion is that the employee's overall hearing is at least 25 decibels above audiometric zero. (7) This criterion determines whether the employee's overall hearing ability is acceptable, because hearing tests give hearing level results only above audiometric zero.
However, it cannot be adjusted during the determination of whether the overall hearing level is 25 decibels above audiometric zero.
In Mocicki et al.'s study of 2,293 people aged 57 to 89 years, they defined hearing loss as "a threshold level greater than 20 dB above audiometric zero for at least one frequency from 0.5 to 4 kHz" in the better ear [8].