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

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

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