to assign a ground truth stage label for every 30-second epoch. In addition, at-home testing was performed using an EEG-based device with automated scoring ...

https://www.apple.com/jp/healthcare/docs/site/Estimating_Sleep_Stages_from_Apple_Watch_Sept_2023.pdf

and older. During the hearing test, tones are played across a range of frequencies from 250Hz to 8000Hz at various intensities. Hearing tests are typically ...

https://www.apple.com/jp/health/pdf/Hearing_Health_Features_on_AirPods_Pro_2_October_2024.pdf