Fig 1.
The 6MWT of the GRAIL system.
Fig 2.
Protocol of 6MWT assessment.
Table 1.
Sample characteristics.
Table 2.
The GRAIL 6MWTs.
Table 3.
Best 6MWT in the overground and GRAIL condition.
Fig 3.
Differences between the best overground 6MWT and GRAIL 6MWT in (3A) patients with COPD and (3B) healthy elderly. Bland-Altman plots of the difference between the best overground 6MWT and best GRAIL 6MWT, plotted against the mean value of the two tests in each group. The central solid lines represent the mean difference between the two methods, whereas the lower and upper dashed lines represent the limits of agreement (1.96 SD of mean value).