Notifications
Prior to the current messaging trial, all eFHS participants received the following types of standard notifications through the eFHS app: (1) “Welcome to eFHS,” (2) “New surveys are available,” (3) “Reminder to complete surveys,” (4) “Surveys due,” and (5) “Thank you for completing surveys.” In addition, standard notifications were sent if no device data were received in the previous 2 weeks (We sent weekly notifications through the app focusing on the following three comparisons: (1) personalized motivational reminder messaging versus standard messaging, (2) messaging sent on a weekend versus weekday, and (3) messaging sent in the morning versus the eveningIntervention groups in the 2 × 2 × 2 factorial design of the electronic Framingham Health Study messaging trial and the number of participants. Sat: Saturday; Wed: Wednesday.