Evaluation of three hearing and fitting formulae using real ear measurement

The general goal of fitting a hearing aid is to optimize the patient's quality of hearing. Selection of hearing aid parameters is based on gain and frequency response of the aid. It is a difficult task to compare various fitting formulae relative to their values in satisfying patient's needs. In this study 109 ears were examined and the results of their real ear measurement according to the 3 fitting formulae were compared. From the results it was concluded that NALII is superior to POGO II and Libby's formulae