Questionnaires
For the measurement of subjective satisfaction, the APHAB and IOI-HA were used. The APHAB consists of 4 items: ease of communication, reverberation, background noise, and aversiveness of sounds. Each item has 6 questions, and higher scores indicate greater disability. This survey can be used to evaluate the performance of an HA in unaided and aided conditions. The IOI-HA is a self-estimation tool designed to check the efficiency of HA fitting [