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

Table 5

The suggested regression equations and cut points obtained for two subgroups of differing age; group 1: age 24–42 (35.7 ± 5.7) years, n = 20; group 2: age 43–62 (50.0 ± 5.5) years, n = 22. β: regression coefficient; CI: confidence interval; SEE: standard error of the estimate; MPA: moderate physical activity; VPA: vigorous physical activity.

Age group	Parameter	β	95% CI	P	SEE	Cut-point MPA	Cut-point VPA
	Intercept	2.436	2.074 to 2.798	<.001
24–42 years	Counts/min	4.170E−4	2.350E−4 to 5.986E−4	<.001	0.63	1208	5525
	Counts/min^2	4.128E−8	1.377E−8 to 6.879E−8	.004
	Intercept	2.921	2.457 to 3.385	<.001
43–62 years	Counts/min	5.149E−4	2.759E−4 to 7.539E−4	<.001	0.88	152	4465
	Counts/min^2	3.912E−8	−1.372E−9 to 7.961E−8	.058