Abstract
The relationship between hearing threshold level and speech discrimination score was studied in 806 cases of bilateral sensori-neural hearingloss. The correlation coefficient between hearing threshold and speech discrimination score in the subjects was 0.719. The difference of hearing threshold level between each ear in a subject and difference of speech discrimination score were distinct, and it was 0.833. The 10% decrease in speech discrimimation score corresponded to a 10dB increase in hearing threshold level. Based on the latter correlation, the 80% reliability range for the estimation of the hearing threshold level was 15dB. When the speech discrimination scores of both ears were compared for a subject, the degree of difference in inner ear impairment could be assessed by decreasing the influence from the central auditory pathway, which varied between subjects.
