Table 1.

Mobile devices and data collection

Data	Instrument	Description	Data points
Exercise	Triaxial accelerometer and associated fitness app by Fitbit	Tracks data on the frequency and timing of steps	Daily: steps, minutes sedentary, minutes active, distance traveled
Weight	Cellular-enabled Scale by BodyTrace	Tracks weight	Daily weight
Glucose	Food and Drug Association–approved wireless glucometer by iHealth	Tracks blood glucose readings	As prescribed by primary care physician
Medication adherence	Self-report via short message service text message [23]	Medication adherence over the last week	Baseline, biweekly up to 6 months
Hemoglobin A1c	Electronic health record (EHR) laboratory results	Average level of blood sugar over the previous 3 months	Gathered from the EHR as available at baseline and 3 and 6 months post baseline