Bland-Altman plots for daily energy expenditure.

<p>Bland-Altman plots depicting bias and 95% limits of agreement of 24 hr energy expenditure for a range of commercial activity trackers relative to the criterion individually calibrated Actiheart device. Bias represents (predicted expenditure—criterion expenditure). The solid line represents absolute bias, the dashed lines the upper and lower 95% limits of agreement and the dotted line represents perfect agreement.