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Table 3 Pearson (r) and Spearman (ρ) Correlations between Fitbit and GT3X+ SED and MVPA estimates

From: Concurrent validity of the Fitbit for assessing sedentary behavior and moderate-to-vigorous physical activity

   Fitbit Flex
   SED (r/ρ) MVPA (r/ρ)
GT3X+ SEDa (Freedson/Troiano) 0.90 / 0.86 −0.28 / -0.32
  MVPAb (Freedson) −0.24 / -0.25 0.66 / 0.71
  MVPA (Troiano) −0.22 / -0.24 0.65 / 0.69
  MVPA (VM3) −0.31 / -0.35 0.76 / 0.79
  1. aSED: sedentary behavior
  2. bMVPA: moderate-to-vigorous physical activity
  3. P < .05; P < .01;