Comparative Study of the 57-S List and the 57 List in Connection with Moderate and Moderately Severe Sensorineural Hearing Loss

Abstract

The intelligibility difference between the 57-S List and the 57 List was studied using six intensity levels in 12 cases of moderate and moderately severe sensorineural hearing loss.
The results were summarized as follows: (1) The maximum discrimination score showed no significant difference between the two lists. The intensity level of the maximum discrimination score was obtained at the condition of 30dB on both lists. (2) Intelligibility on the two lists improved about 40 percent when the intensity level increased from 0dB to 30dB. (3) The 57-S List showed about 10 percent better results than the 57 List under the conditions of lower intensity level compared with that of the maximum discrimination score. (4) In the discrimination score of consonants on the 57-S List, voiceless consonants were improved under the condition of 30dB and 20dB. Voiceless consonants, voiced consonants and semivowels were identified under the 10dB condition. As for nasal and vowels, there were no significant differences between the 57 List and 57S List.
Therefore, the 57-S List is considered to be available instead of the 57 List as far as the items (3) and (4) mentioned above are concerned.