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Mean reduction rate of PA in COPD patients compared to healthy subjects. Mean reduction rate of PA in COPD patients was calculated as 100 × [(mean duration of PA in COPD) − (mean duration of PA in healthy subjects)]/(mean duration of PA in healthy subjects) at each intensity of PA. PA: physical activity; COPD: Chronic obstructive pulmonary disease; METs: metabolic equivalents. Quoted from reference [5].
