Fig. 2
From: Reliability and validity of ten consumer activity trackers
Bland-Altman plots of the top three activity trackers in the laboratory condition (Optogait vs. Fitbit Zip, Lumoback, and Withings Pulse, figure a-c) and free-living condition (ActivPal vs. Fitbit Zip, Misfit Shine, and Lumoback, figure d-f). The middle line shows the mean difference between the tracker and the gold standard, and the dashed lines indicate the limits of agreement (±1.96 * SD of the difference scores)