Opting for two hearing aids: a predictor of long-term use among adult patients fitted after screening.

This study is a follow-up of patients fitted with one or two hearing aids, approximately 10 years previously. Our patients were identified through population screening for hearing difficulties when they were aged 50-65 years. At the time, they had a trial of unilateral and bilateral fittings, and then they made their own choice to keep one or two aids. We found that 10 of the 12 who had opted for two aids and were available for follow-up 10 years later continued using at least one aid (83%, 95% CI 55-95). Six of the 17 who opted for unilateral fitting and were available for follow-up used a hearing aid in the long term (35%, 95% CI: 17-59%). Therefore, this study suggests that people who are identified through population screening, are bilaterally impaired, are willing to try bilateral fitting, and choose to continue with two aids, are likely to become long-term users of (one or two) hearing aids. Those who choose to continue with one aid after a trial of bilateral fitting are at high risk of rejecting the aid in the long term. Our sample is small, and we took a number of steps in the analysis in order to clarify whether these findings are reliable. We could not identify any confounding factors. The patients' preference for continuing with bilateral or unilateral aids after fitting was the only predictor of long-term use in our sample. Remarkably, bilateral preference was a better predictor of long-term use than the degree of hearing impairment. We discuss how this study provides useful information for planning population screening for hearing difficulties in middle age.