The relation between the most frequently used gain (MFUG) of hearing aids and hearing levels was studied in 335 cases with mild to moderate sensorineural hearing loss. The MFUG was measured at 500, 1000 and 2000Hz, and these hearing aids were selected and adjusted by repeated audition in every day life.
The results were as follows:
1) As the average hearing levels increased, the MFUG (averaged by 500, 1000, 2000Hz) was increased. But, the MFUG was different from individual to individual among the same hearing level groups.
2) In the study of each frequency, as the hearing level increased, the MFUG was increased. And the degree of increase of the MFUG differed in each frequency. And in the case with mild hearing loss, the MFUG of high frequency was relativery large, and as the hearing became worse, the difference of the MFUG in each frequency became smaller.
3) Comparing the MFUG with the gain by half gain method, the MFUG was smaller than the half gain. The half gain was located near the limit of the range of the MFUG.
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