<b><i>Introduction:</i></b> The narrowband chirp (NB Chirp), a frequency-specific sound stimulus signal obtained by limiting the frequency bandwidth based on chirp, is applied to the frequency specified auditory brainstem response (fsABR) increasingly. Although some studies demonstrated that NB Chirp-evoked auditory brainstem response (NB Chirp ABR) causes a better neural response than tone burst-evoked auditory brainstem response and is preferred for fsABR, there is little known about how to better estimate an individual’s hearing level through the threshold of NB Chirp ABR. The present study intended to compare the accuracy and deviation of NB Chirp ABR corrected by different approaches in estimating the hearing level of people with normal hearing. <b><i>Methods:</i></b> A total of 66 volunteers with normal hearing were randomly divided into a model group (<i>n</i> = 26), test group 1 (<i>n</i> = 20), and test group 2 (<i>n</i> = 20). The model group was used to calculate the threshold difference between NB Chirp ABR and pure-tone audiometry at 500 Hz, 1,000 Hz, 2,000 Hz, and 4,000 Hz, as well as the regression equation, providing a reference for the correction of estimated hearing level of NB Chirp ABR. Test group 1 was used to observe the accuracy and deviation of the “noncorrection (N),” “threshold difference (A1),” and “regression equation (A2)” methods in correcting the estimated hearing level of NB Chirp ABR. Test group 2 was used to replicate the analysis of test group 1 to verify the repeatability of the experimental results. All data were analyzed using SPSS 24.0. <b><i>Results:</i></b> Test group 1 and test group 2 had similar results. First, the accuracy of the estimated hearing level of N was significantly higher than that of A1 or A2. Second, compared with “0,” the deviation of the estimated hearing level of N was bigger than that of A1 or A2 at 500 Hz and 1,000 Hz, while similar at 2,000 Hz and 4,000 Hz. Finally, there was no significant difference in the deviation of the estimated hearing level between A1 and A2 at 500 Hz and 1,000 Hz. <b><i>Conclusion:</i></b> Among people with normal hearing, it was necessary to correct NB Chirp ABR at 500 Hz and 1,000 Hz for lower deviation of the estimated hearing level. Both correction approaches based on threshold difference and regression equation can be used.
Background: Optimal medical intervention for veterans suffering from military noise-induced hearing impairment is a major concern of the specialists in military medicine, otology, and audiology sectors. Thus, it is important to objectively and accurately reflect the hearing level of the subject in the intervention to aid hearing and improve the existing hearing disability evaluation program. Purpose: The present study intends to identify the optimal correction scheme by comparing the accuracy and range of deviation of narrow-band chirps evoked auditory brainstem responses (NB Chirp ABR) corrected by different schemes in estimating the hearing level of people with normal hearing. Methods: A total of 66 individuals could hear sounds of a frequency <25dB hearing level (HL) in the pure tone audiometry were randomly divided into a model group (26 subjects), test group 1 (with 20 subjects), and test group 2 (with 20 subjects). The mean threshold difference and the regression equation at each frequency were obtained through the model group, and the correction results of the “mean threshold difference scheme (S1)” and the “regression equation scheme (S2)” were compared in the test groups 1 and 2. All data were analyzed using SPSS 24.0. Results: 1) The accuracy of the estimated hearing level (eHL) of non-corrected NB Chirp ABR was significantly higher than that of NB Chirp ABR corrected by S1 or S2; 2) The range of deviation of the eHL of non-corrected NB Chirp ABR from the pure tone audiometry threshold was greater than that of NB Chirp ABR corrected by S1 or S2 from the pure tone audiometry threshold at 500 and 1000 Hz, while at 2000 and 4000 Hz, the values were similar. Conclusion: Among people with normal hearing, it was necessary to correct NB Chirp ABR at 500 and 1000 Hz for higher accuracy of the eHL, but the strengths of different correction schemes were not defined. For clinical convenience, the “mean threshold difference scheme,” with the correction values of 7 and 4 dB, was recommended for correction. At 2000 and 4000 Hz, it was not necessary to correct NB Chirp ABR. Thus, additional subjects with different HLs should be included in future studies to discuss the differences between the two schemes.
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