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 |
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) |
r | r | r | |
---|---|---|---|
MVPA correlation | .67 | .79 | .94 |
Steps correlation | .72 | .92 | .96 |