Functional Capacity Beyond 350 m in Patients with Chronic Obstructive Pulmonary Disease: A Retrospective Analytical Study

Background

The six-minute walk test (6MWT) in chronic obstructive pulmonary disease (COPD) may be interpreted using either an absolute walking-distance threshold or a percentage of the predicted distance, but these approaches are rarely compared within the same cohort. We examined whether absolute and relative 6MWT criteria classify functional impairment differently and whether they show different associations with resting hypoxemia.