Treadmill Calibration of the Actigraph GT1M in Young-to-Middle-Aged Obese-to-Severely Obese Subjects

Table 3

The effect (unstandardized regression coefficients (P value)) of walking speed, age, and body weight on metabolic cost and accelerometer counts during treadmill walking at 2, 3, 4, 5, and 6 km/h.

	METs	𝑉O2 (L/min)	𝑉O2 (mL/kg/min)	Counts/min*
Walking speed (km/h) (1st order)	−0.002 (.971)	0.004 (.852)	−0.044 (.770)	1006.662 (<.001)
Walking speed (km/h) (2nd order)	0.136 (<.001)	0.049 (<.001)	0.415 (<.001)	—
Age	0.025 (.041)	0.007 (.031)	0.060 (.015)	−27.439 (.027)
Body weight	0.003 (.582)	0.013 (<.001)	0.004 (.747)	2.437 (.672)

* The second order term of walking speed was omitted due to a nonsignificant association with the dependent variable.