Outcomes
The primary outcome of interest was enrollment, defined by account registration and consent into the Health eHeart Study, among contacted patients. In the Health eHeart Study, enrollment occurs in 2 crucial steps: registration and consent. We also looked at these 2 steps separately. We defined registered patient participants as those who set up a Health eHeart Study account with a name, date of birth, email, and password. We defined consented patient participants as registered patients who indicated their willingness to participate, after being shown the consent form, by clicking on an “I want to participate” button.