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Table 2 Mean difference scores (gold standard – activity tracker) and MAPE in the laboratory and free-living condition

From: Reliability and validity of ten consumer activity trackers

Laboratory Condition 1

Free-living condition 2

 

N

Mean difference (SD) a

MAPE b

t-value/Z-value c

P-value

N

Mean difference a

MAPE b

Z-value c

P-Value

ActivPAL

25

9 (6)

0.3

7.19

0.000 *

55

    

Lumoback

32

8 (20)

0.2

2.24

0.033 *

51

17

0.4

−0.97

0.332

Fitbit Flex

33

188 (219)

5.7

4.93

0.000 *

54

−150

3.7

−2.23

0.026 *

Jawbone UP

32

34 (123)

1.0

1.60

0.119

53

−58

1.4

−0.24

0.851

Nike+ Fuelband

33

598 (618)

18.0

−4.36

0.000 *

20

977

24

−3.55

0.000 *

Misfit Shine

33

−6 (43)

0.2

−0.80

0.430

55

−43

1.1

−0.36

0.719

Withings Pulse

32

15 (23)

0.5

3.70

0.001 *

51

323

7.9

−5.24

0.000 *

Fitbit Zip

32

11 (12)

0.3

5.44

0.000 *

55

−49

1.2

−2.66

0.008 *

Omron

32

−82 (157)

2.5

−2.96

0.006 *

55

17

0.4

−0.71

0.479

Digiwalker

32

38 (145)

1.2

1.46

0.153

55

240

5.9

−2.04

0.041 *

Moves app

33

−319 (366)

9.6

−4.36

0.000 *

11

1529

37.6

−2.85

0.004 *

  1. 1Mean (±SD) Optogait = 3314 (±162) 2 Mean (±SD) ActivPAL = 4070(±2430) *significant p-value indicating a systematic difference of the activity tracker. apositive values indicate an underestimation of the activity tracker and negative values indicate an overestimation. b MAPE = mean absolute percentage error cIn case of non-normality the Wilcoxon Signed Rank Test was used instead of the Paired Samples T-test
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BMC Sports Science, Medicine and Rehabilitation

ISSN: 2052-1847

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