Apple Heart Study: Assessment of Wristwatch-Based Photoplethysmography to Identify Cardiac Arrhythmias

Inclusion Criteria:

Possession of the following at time of eligibility screening, ascertained from automatic
hardware/software/device pairing check:

   - iPhone (5s or later) with iOS version 11.0 or later defined as iPhone model/iOS
   version used to complete screening eligibility.

   - Apple Watch (Series 1 or later) with watchOS version 4.0 or later defined as Apple
   Watch model/watchOS paired with iPhone used to complete screening eligibility.

   - Current resident of the United States at time of eligibility screening, defined by
   self-reported state of residence within the 50 states of the United States or District
   of Columbia.

   - Proficient in written and spoken English, defined by self-report of comfort reading,
   writing, and speaking English on iPhone.

   - Valid phone number associated with iPhone, ascertained from self-report.

   - Valid email address, ascertained from self-report.

Exclusion Criteria:

   - Self-reported diagnosis of Atrial Fibrillation.

   - Self-reported diagnosis of Atrial Flutter.

   - Currently on anti-coagulation therapy.