Auditory Training and Hearing Aid Satisfaction

The Client Orientated Scale of Improvement (COSI), a subjective measure of improvement on self-defined goals. The scale is relative to a baseline assessed before wearing hearing aids. For each goal participants select from a scale of improvement including Worse (-1), No Difference (0), Slightly Better (+1), Better (+2), and Much Better (+3). Positive values between one and three indicate improvement, negative values indicate that the self-defined goals got worse, and zero is no improvement. COSI scores were assessed before and after participants used the Amptify DTx. The outcome measure reported is the difference between scores before and scores after using the Amptify DTx.

The International Outcome Inventory for Hearing Aids (IOI-HA) is a hearing aid satisfaction questionnaire that averages a series of seven questions on a five-point scale (0-5 possible points of improvement). IOI-HA scores were assessed before and after participants used the Amptify DTx. The outcome measure reported is the difference between scores before and scores after using the Amptify DTx. Higher values between 1 and 5 indicate more relative satisfaction.

Abbreviated Profile of Hearing Aid Benefit (APHAB) is common clinical questionnaire for determining hearing aid benefit using a series of 24 questions on a seven-point scale (A-G; the scale is then converted to "percent of time" from 1% (Never) to 99% (Always) and 50% means half of the time). Hearing aid benefit is calculated as the difference between the performance with a hearing and and performance without a hearing aid. More positive values indicate more benefit.

The Speech, Spatial and Qualities of Hearing Scale (SSQ-12) is a subjective tool or assessing the quality of the sound from a hearing aid using a 12-item questionnaire. Questions focus on how well the participant could hear in various situations. The responses range on a scale from "Not At All" (0) to Perfectly (10). Higher values indicate better sound quality.

Daily use (in hours/day) is logged by the participant. Improvement is indicated by an increase in the amount of time the participant uses the hearing aid each day.

The NU-6 is a standard clinical assessment of word discrimination. Lists consist of 50 words in quiet and were presented through the Amptify DTx while wearing the hearing aid. NU-6 scores are in percent words correctly identified. Scores reported here are the difference between scores measured before and after completing the Amptify DTx.