Assessment of physical activity is an important part of COPD management, because physical inactivity is associated with mortality and morbidity in this disease group [1]. The most commonly used physical activity outcome is daily step count, typically measured using an accelerometer or pedometer [2]. Outside the research arena, pedometers are used more commonly than accelerometers due to lower cost, simplicity and acceptability to patients. Although previous studies have described the minimal clinically important difference (MCID) in accelerometer daily step count, these estimates are not appropriate for the interpretation of meaningful changes in pedometer step count, as pedometers are less reliable in capturing daily step count [3]. The MCID for improvement in daily pedometer step count in patients with COPD undergoing pulmonary rehabilitation is not known, and there are limited data on MCID for deterioration in pedometer step count. The aim of our study was to provide an estimate of the MCID for daily pedometer step count in patients with COPD, using response to pulmonary rehabilitation as a model of improvement and longitudinal decline following pulmonary rehabilitation as a model of deterioration.
Pedometer step count improves with pulmonary rehabilitation and deteriorates with time. The MCID for improvement and deterioration is 427 and −456 steps, respectively, but there is uncertainty about the reliability of these estimates. https://bit.ly/3ci97Jh
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