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Table 4 Mean data for Polar M430 and ActiGraph, and correlation, p-value, mean absolute percentage error, and Bland-Altman mean difference and limits of agreements (LoA), for steps, moderate-to-vigorous physical activity, and total energy expenditure. Person-days: n = 203

From: Succeeding with prolonged usage of consumer-based activity trackers in clinical studies: a mixed methods approach

Variable

Polar

ActiGraph

Correlation (95% CI)

P-value

MAPE

Mean difference

Lower LoA

Upper LoA

Steps

8956 (5106)

5165 (3230)

0.625 (0.44, 0.70)

< 0.001

119.5%

3791

− 4860

12,442

MVPA

143 (97)

44 (32)

0.495 (0.31, 0.53)

< 0.001

373.9%

99.0

−80.4

278.4

TEE

2868 (581)

2967 (458)

0.446 (0.50, 0.69)

< 0.001

10.6%

− 98.7

− 948.5

751.1

  1. Numbers are means (standard deviations). MVPA Moderate-to-vigorous physical activity, TEE Total energy expenditure, Correlation Repeated measurement correlation with 95% confidence interval, MAPE Mean absolute percentage error, LoA Limits of agreement