The validation of Fitbit Zip™ physical activity monitor as a measure of free-living physical activity

BMC Research Notes

Table 2 Comparison of the Fitbit Zip™ with the Actigraph and Yamax devices (n = 42)

	Spearman correlation		Wilcoxon signed rank test
	r	p-value	p-value
Fitbit vs Actigraph (steps/day)	0.91	<0.001	<0.001
Fitbit vs Yamax (steps/day)	0.91	<0.001	0.11
Fitbit (steps/day) vs Actigraph (MVPA mins/day)	0.86	<0.001	-*

*It was not possible to compare differences between Actigraph measured MVPA with Fitbit steps/day as they are in different units.

ISSN: 1756-0500