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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This is a summary of
the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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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
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Locations
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University of Michigan School of Public Health
Ann Arbor, Michigan, 48109, United States