Table 4.

Energy expenditure during phase 1 free-living activities.

Level of intensity	Energy expenditure (kcal/min)		Bias (kcal/min)
	Movn Mean (SD)	ActiGraph Mean (SD)	Mean (95% CI)
Light (<3 metabolic equivalent of task [MET])	2.43 (1.15)	1.61 (1.34)	0.83 (0.81-0.84)c,d
Moderate (3-6 MET)	2.32 (0.86)	1.01 (0.65)	1.31 (0.69-1.93)c,d
Hard (6-9 MET)	4.19 (1.49)	2.24 (1.6)	1.96 (1.87-2.04)a,b,d
Very hard (≥9 MET)	7.66 (1.19)	4.25 (2.01)	3.41 (3.16-3.66)a-c
Total	2.73 (1.51)	1.73 (1.45)	1.00 (0.98-1.02)e

^a-dSystematic difference in biases between activity intensity levels (P<.001-.02, Bonferroni-corrected).

^aLight.

^bModerate.

^cHard.

^dVery hard.

^eOverall systematic bias compared with the ActiGraph device (P<.001).