A total of 70 subjects, 34 men and 36 women, aged 18-71 years (mean 36, standard deviation 11) participated in the trial. The results were compared with pure-tone audiometry. An audiologist-assisted self-measurement was conducted by the participants in a sound booth, and it involved determining the lowest audible sound generated by the device within the frequency range of 250 Hz to 8 kHz. These reference sound levels were previously determined in uncontrolled conditions in relation to the hearing threshold of normal-hearing persons. The hearing threshold was obtained on a mobile device by means of an open access app, Hearing Test, with incorporated model-specific reference sound levels. Trial participants were recruited offline using face-to-face prompting from among Otolaryngology Clinic patients, who own Android-based mobile devices with bundled headphones. This study aimed to compare the hearing threshold measured by a mobile device that was calibrated using a model-specific, biologically determined reference sound level with the hearing threshold obtained in pure-tone audiometry. In the case of devices provided by the manufacturer, together with bundled headphones, the reference sound level can be calculated once for all devices of the same model. Calibration consists of determining the reference sound level and can be performed in relation to the hearing threshold of normal-hearing persons. Hearing screening tests based on pure-tone audiometry may be conducted on mobile devices, provided that the devices are specially calibrated for the purpose. Masalski, Marcin Grysiński, Tomasz Kręcicki, Tomasz Hearing Tests Based on Biologically Calibrated Mobile Devices: Comparison With Pure-Tone Audiometry.
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