Table 6.

Description of activity time measured by Fitbit Alta, Garmin Vivofit 4, Letscom, and Actigraph GT3x.

Monitor		Activity time		Light activity		Moderate-to-vigorous activity		Total activity
		Mean (SD)	Median (min, max)	Mean (SD)	Median (min, max)	Mean (SD)	Median (min, max)	Mean (SD)	Median (min, max)
Fitbit Alta	19	3.0 (10.2)	0 (0, 43)	n/a	n/a	n/a	n/a	n/a	n/a
Garmin Vivofit 4	19	0 (0)	0 (0, 0)	n/a	n/a	n/a	n/a	n/a	n/a
Letscom	18	18.7 (5.3)	18.5 (8, 31)	n/a	n/a	n/a	n/a	n/a	n/a
Actigraph GT3x+	18	n/a	n/a	34.6 (11.7)	31.5 (17, 56)	3.2 (3.2)	3 (0, 11)	37.7 (12.1)	35 (17, 57)