300,000 iPhone users join Apple's landmark hearing study
NCT ID NCT04172766
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study, run by Apple and the University of Michigan, tracks headphone and environmental sound exposure in 300,000 US adults using iPhones and Apple Watches. Participants answer surveys and take hearing tests through the Research app. The goal is to understand how everyday sounds affect hearing over time and to guide public health policies.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of Michigan School of Public Health
Ann Arbor, Michigan, 48109, United States
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Other studies related to the condition(s) this trial covers.
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