TABLE 1.

Information on Wearable Physical Activity (PA) Trackers Used in Four Different Research Studies

Study	Devices Used	Location of Device Wear	Data Output	Average Price of Devicea	Used for Intervention or Assessment in the Study?	Devices Lost During the Study, % (n)	Devices That Lost Data or Malfunctioned During The Study, % (n)
Mobile family research	iBitz	Waist (but can also be clipped to other locations)	• Steps	$35 (child); $50 (parent)	Intervention	0 (0)	40 (4)
	Zamzee	Waist (but can also be clipped to other locations)	• Minutes in “Zamzone” • Available on the back-end for researchers: moderate to vigorous PA (minutes)	$30		0 (0)	0 (0)
	FitBit Flex	Wrist	• Steps • Calories expended • Distance (miles) • Sleep (time)	$100		0 (0)	0 (0)
	Omron Pedometer	Waist	• Steps	$20		0 (0)	0 (0)
IMAGINE	Sensewear Armbands	Upper arm	Extensive data including: • Time spent wearing armband • Total and active energy expenditure • Total PA duration, including sedentary, moderate, vigorous, and very vigorous • Steps • Time spent lying down and in sleep • Average metabolic equivalents Additional data can be obtained from the minute-level data including: • Detailed data on sleep (e.g., efficiency, latency) • More specific PA data (e.g., 10-minute bouts) • Skin/body temperature and galvanic skin response	N/A—devices are no longer being made	Assessment	0 (0)	4.9 (2)
Vegan Bytes	MisFit Flash	Wrist (but can also be clipped to shoe)	• Number of points out of 1,000 (related to number of steps taken) • Steps • Calories expended • Distance (miles) • Total sleep (as well as light sleep and restful sleep)	$25	Assessment	12 (2)	87 (13)
HealthE-U	FitBit Zip	Waist (or other location clipped to clothing)	• Steps • Calories expended • Distance (miles)	$60	Intervention	29 (3)	3 (1)

^aPrices were obtained by the latest for what is currently available online (as of December 2015) or what the study paid for them.