Table 2.

Wrist-worn accelerometer VM cut points established by each ML model and mean count value within each PA category.

Model		N		Cut points (cpma)			Vector magnitude counts (cpm)
					Lower Bound	Upper Bound		Mean (SD)
Receiver operating characteristic analysis
	Sedentary behavior		70,848		0	3406		744.40 (1077.67)
	Light physical activity		20,194		3407	5690		4509.79 (652.33)
	Moderate physical activity		4009		5691	6219		5952.98 (150.75)
	Vigorous physical activity		27,348		6220	∞		10,054.39 (4267.24)
Ordinal logistic regression model
	Sedentary behavior		92,143		0	5837		1629.59 (1900.25)
	Light physical activity		26,746		5838	14,020		8436.16 (2028.01)
	Moderate physical activity		1688		14,021	17,432		15,481.18 (968.54)
	Vigorous physical activity		1822		17,433	∞		22,350.31(4593.46)
K-means analysis
	Sedentary behavior		62,815		0	2556		457.57 (759.38)
	Light physical activity		37,876		2557	7067		4655.99 (1270.28)
	Moderate physical activity		18,559		7068	14,535		9474.95 (1895.16)
	Vigorous physical activity		3149		14,536	∞		19,595.06 (4787.10)

^acpm: counts per minute.