Lee et al. (2018) examined selective symptoms (dyspnea, anxiety, depression, and fatigue) to predict their contribution to impaired physical performance in patients with COPD. Dyspnea was measured with FEV1; anxiety, depression and fatigue were measured with multi-item Likert scales. Physical performance was measured with the 6MWT, which was the distance patients could walk in 6 minutes. What is the level of measurement for each of the study variables?
[Expert Solution]: Lee et al
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