Table 3.

Frequency of devices and sensor types in included studies. The device is the tracker used by the patient (first column), which may include different sensors that are detailed in the second column. Note that, since a device can use several sensors, the total number of occurrences in the second column is much greater than that of the first column.

Device Type		Sensor Type
IMU	39	Accelerometer	39 (100%)
		Gyroscope	30 (77%)
		Magnetometer	8 (20%)
		Others	7 (18%)
Sensors	17	Accelerometer	14 (82%)
		Gyroscope	1 (0.7%)
		Magnetometer	1 (0.7%)
		Others	4 (3%)
Smartphones	18	Accelerometer	17 (94%)
		Gyroscope	7 (38%)
		Magnetometer	2 (11%)
		Others	1 (5%)