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Table 1 Participant characteristics and accelerometer data

From: Validation of the Fitbit Zip for monitoring physical activity among free-living adolescents

  Cohort 1 (N = 25) Cohort 2 (N = 35) Cohort 3 (N = 27)
% % %
Gender (% male) 48 47 40
Hispanic 32 44 41
Non-hispanic white 24 27 30
African–American 32 15 0
Multi-racial/other 12 12 22
  1. p for all r’s < .001
  Mean (SD) Mean (SD) Mean (SD)
Age 12.76 (.72) 11.15 (.43) 12.74 (.52)
BMI percentile 66.88 (32.46) 59.17 (33.27) 62.29 (23.77)
VO2 peak (ml/kg/min) 34.95 (9.19) 44.00 (8.01) 37.69 (7.66)
Number of days of valid ActiGraph data 6.00 (.85) 5.49 (.83) 6.00 (.89)
Number of days of valid Fitbit data 6.04 (.97) 6.65 (.70) 6.10 (.89)
MVPA ActiGraph (min/day) 32.44 (12.91) 55.94 (26.89) 42.78 (26.14)
MVPA Fitbit (min/day) 117.63 (21.37) 52.84 (32.79) 40.07 (30.95)
Steps ActiGraph (per day) 7868 (1703) 10,271 (2504) 8523 (2866)
Steps Fitbit (per day) 8874 (1646) 10,723 (2853) 8921 (2911)
  1. p for all r’s < .001
  r r r
MVPA correlation .67 .79 .94
Steps correlation .72 .92 .96
  1. p for all r’s < .001