Anyone who meets all of the participation requirements may participate:
– You own an Apple Watch Series 1 or later paired with your iPhone;
– You are at least 18 years old (at least 19 years old in Alabama and Nebraska, at least 21 years old in Puerto Rico)
– You live in the United States of America
– You are comfortable communicating in written and spoken English
– You have installed the Apple Research app on your iPhone
– You do not share your iCloud account, iPhone, or Apple Watch with anyone else
– You are willing and able to provide informed consent to participate in the study