electroencephalography (EEG), electrocardiogram (ECG), pulse oximetry, airflow, and leg movements. Sleep stages are assigned by human experts based on visua...

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

user privacy, or contain known malware, which is software used for bad or dangerous purposes. A study found that devices that run on Android had 15 times mo...

https://www.apple.com/jp/privacy/docs/Building_a_Trusted_Ecosystem_for_Millions_of_Apps.pdf