Mean audiometric subject thresholds.

<p>Auditory thresholds are shown for right and left ears for the standard audiometric frequencies from 250(NH) group are depicted in blue; the hearing loss (HL) group in red. The positive-going blue bars illustrate the standard deviation for the average threshold at the designated frequency for the NH group, and negative-going red bars illustrate the standard deviation for the HL group. The solid black line illustrates the criterion for normal hearing, at 25 dB HL.