Bland-Altman plots of agreement between free-living steps per day.

<p>The pairwise comparisons of the difference between steps per day (shown in 1000 steps per day) plotted by the average steps per day. The correlation coefficients and 95% confidence intervals are for the relationship between the difference in steps per day between the monitors and the average steps per day of the monitors. A significant correlation indicates significant heteroscedasticity. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018942#pone-0018942-g001" target="_blank">Figure 1A</a> shows the difference between the AX120 hip-worn pedometer and the AMP-331 ankle-worn accelerometer by the average of the AX120 and AMP steps per day. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018942#pone-0018942-g001" target="_blank">Figure 1B</a> shows the difference between MTI hip-worn accelerometer and AMP-331 ankle-worn accelerometer steps per day by the average of MTI and AMP steps per day. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018942#pone-0018942-g001" target="_blank">Figure 1C</a> shows the difference between MTI hip-worn accelerometer and AX120 hip-worn pedometer steps per day by the average of MTI and AX120 steps per day.