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The effect of fitting formulas in programmable hearing aids on speech discrimination in noise
Songül Elmaci Dündar1, Songül Aksoy
1songuldundar@hotmail.com
Objectives:
This study was performed to compare three fitting formulas for programmable hearing aids in noisy environments using speech discrimination tests.
Patients And Methods:
The study included 17 hearing impaired subjects (9 males, 8 females; mean age 28 years; range 15 to 45 years) with bilateral symmetrical sensorineural hearing loss. Speech discrimination tests were carried out at various signal-to-noise ratios (SNR) at +5, 0, -5 dB, based on the NAL (National Acoustic Laboratories), POGO (Prescription of Gain/Output), and Berger fitting formulas with programmable hearing aids.
Results:
When the SNR was +5 dB, speech discrimination scores of NAL and Berger were similar. Both had significantly better scores than POGO (p=0.017). When the SNR was 0 dB, speech discrimination scores differed significantly between the three formulas, with NAL having the best score, and Berger having a better score than POGO (p=0.017). When the SNR was -5 dB, the scores were similar between NAL and Berger. Both had significantly higher scores than POGO (p=0.017).
Conclusion:
Our results show that there are significant differences in terms of speech discrimination scores among the fitting formulas.
