. 2019 Apr 15;8(4):e12144. doi: 10.2196/12144

Table 1.

Data captured by the smartphone and wearable and saved in the study app.

Source	Data saved in study app
Health Kit (only access to the listed data is preset in the study app)	Number of steps^a
	Number of stairs
	Walking distance, m^a
	Mean heart rate, beats per min^a
	Number of standing up events
Core Motion (preprocessed data from motion sensors)	Walking time, s
	Stationary time, s
	Exercise time (physically active, more than walking), s
	Automotive time, s
	Cycling time, s
Core Location	Relevant position changes, leaving home location (no continuous data recording; position accuracy: 500 m)^b
Accelerometer and gyroscope raw data	Heart rate during activity, beats per minute

^aSteps, walking distance, and mean heart rate per min are also saved in the 6-min walk distance app.

^bLeaving home location means leaving the 500 m circle that is flagged as home. Daily physical activities over a distance <500 m are detected through steps and raw accelerometer and barometer data.