Average step count in patients with COPD and healthy controls.

P-value compares average steps measured by Dynaport Movemonitor (DAM) to respectively Fitbit Zip (hip-AT) and Fitbit Alta (wrist-AT), using paired t-test.本研究采用配对t检验（paired t-test），以P值（P-value）对比Dynaport运动监测仪（Dynaport Movemonitor, DAM）分别与Fitbit Zip（髋部佩戴活动追踪器，hip-AT）、Fitbit Alta（腕部佩戴活动追踪器，wrist-AT）测得的平均步数。