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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

 

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

  1. p for all r’s < .001