PHYSIOLOGICAL UPPER LIMIT OF PRESBYACUSIS

1) Audiometry was done with 120 normal persons, 20 persons out of each generation from the 2nd to the 7th decade. Mean value, standard deviation, confidence limit of population mean and abandonment limit of normality were calculated for the hearing loss in each generation. 2) The result provided a good objective crite-rion for the interpretation of presbyacusis, thus distinguishing physiologic presbyacusis from non-physiologic.