Normal Hearing Level in Children Aged from One to Three Years Measured by Pediatric Audiometry

Abstract

Pediatric audiometry was carried out in 96 children with normal development and hearing, aged 12 through 43 months. The distributions of auditory thresholds for four frequencies (0.5k, 1k, 2k and 4kHz) obtained from these children had a positive correlation with age, and were reduced as a function of age.
To define the normal limit of hearing level, we calculated the cumulative scores of thresholds obtained from each age group: 12-17 months, 18-23, 24-29, 30-35, and 36-43 months, The data analysis showed that the cumulative score of 85% in every threshold distribution correlated closely with changes in hearing level by age. From a practical point of view, it is useful to regard the hearing level that corresponds to the cumulative score of 85% in each age group as the normal limit of hearing level in each age group.