Reference values for amplified speech Intelligibility index (SII) according to the DSLm[i/o]v5 prescription

Abstract

Objective: build the reference curves for amplified SII values of speech signal in the intensities of 55 and 65 dB NPS, considering the differences between targets prescribed by DSLm[i/o] v5 and the curves obtained in the verification process, as a criterion for a proper amplification, noting the limitations of amplification for the different degrees of hearing loss configurations. Methods: 41 children aged between 3 and 80 months participated in the study, totalizing 78 ears. Auditory thresholds at 250, 500, 1000, 2000, 4000 Hz were considered and SII values for the input signals 55 and 65 dB NPS were obtained in the Verifit®Audioscan hearing aid analyzer. Results: All hearing aids were set as close to the target as possible. According to degree and configuration of the hearing loss limitations in amplification were observed. Reference curves and equations to predict amplified SII values for the intensities of 55 and 65 dBNPS were generated. Conclusion: reference curves for amplified SII values were built and equations were generated to predict SII values according to audiological characteristics and features can be included in protocols of indication of sound amplification and indicate the audiologic follow-up. Reference curves and equations do not override the verification process.