ABSTRACT
Background: The long-term use of earphones at high volume levels is a major risk factor for noise-induced hearing loss. Aim: To compare the hearing of university students who use personal listening devices (PLDs) at extremes (upper & lower quartiles) with respect to a) Duration of use/day b) The number of years since use c) Volume level. Methods: This cross-sectional study was conducted in the Department of Physiology, College of Medicine, at Imam Abdulrahman bin Faisal University (IAU), from September 2021 to April 2022. An online survey was distributed among IAU medical students on the subjects' patterns of earphone use. Forty participants volunteered to participate in the hearing tests: Pure Tone Audiometry (PTA), Tympanometry, and Transient Evoked Otoacoustic Emission (TEOAEs) at the ENT clinic of the King Fahd Hospital of the University (KFHU). Results: The pure tone audiometry and TEOAE showed no significant differences in the hearing thresholds/levels of participants in upper quartiles vs lower quartiles of both ears, in any of the PLD use pattern categories. However, in the TEOAE two observation were detected: a) Significantly lower amplitude in the upper quartile of the category "duration of PLD use/day" at a frequency of 1.0 kHz in the left ear (p-value 0.04) b) Significantly lower amplitude in the upper quartile of the category "volume of PLD use" at a frequency of 1.0 kHz in the left ear (p-value 0.03). Conclusion: The present findings suggest that hearing threshold/level and cochlear outer hair cells' functions do not differ significantly in the participants belonging to the upper and lower quartiles of PLD use pattern (volume level, duration of use/day, and the number of years since use).
