The effect of body mass index on traditional 226 Hz tympanometry and wideband tympanometry test results

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The Turkish Journal of Ear Nose and Throat, vol.30, no.4, pp.113-117, 2020 (Peer-Reviewed Journal) identifier


Objectives: The aim of this study was to investigate the possible effects of body mass index (BMI) on traditional 226 Hz tympanometryand wideband tympanometry (WBT) to gain a better understanding of resonance frequency.Patients and Methods: A total of 158 ears of 79 volunteers (19 males, 60 females; mean age: 20.5 years; range, 18 to 27 years)who had normal hearing and normal otoscopic examination findings were included in the study between October 2019 and June2020. By measuring the weight and height of the participants, their BMI values were classified into three groups: ≤18.5 kg/m2(underweight), 18.5 to 24.9 kg/m2 (normal weight), and ≥25.0 kg/m2 (overweight). Tympanometric evaluations were conducted usingthe Interacoustics-Titan WBT.Results: The difference of ear canal volume (ECV) was significant between the two sexes (p<0.05), while there was no significantdifference in the tympanometric peak pressure, compliance, gradient, and resonance frequency between the sexes (p>0.05). Asignificant difference was found in the ECV and resonance frequency among the three BMI groups (p<0.05). Accordingly, as the BMIincreased, the ECV increased and the resonance frequency decreased (p<0.05).Conclusion: The BMI may affect ECV and resonance frequency values which should be considered during the examination.