Ranking of daily step count by DAM compared to ranking by activity trackers.

DAM compared to hip-AT in COPD (panel A) and healthy controls (panel C) and compared to ranking by wrist-AT, in COPD (panel B) and healthy controls (panel D). The larger the dot, the larger number of subjects for the given combination of ranks, r = Kendall correlation for consistency of ranking. Hip-AT = Fitbit Zip; wrist-AT = Fitbit Alta; DAM = Dynaport Movemonitor.