BACKGROUND AND AIMS Fatigue is associated with longitudinal ratings of health in patients with chronic obstructive pulmonary disease (COPD). Although the degree of airflow obstruction is often used to grade disease severity in patients with COPD, multidimensional grading systems have recently been developed. The aim of this study was to investigate the relationship between perceived and actual ...

Forced expiratory volume in 1 s (FEV1) as a degree of airflow limit2ation has traditionally been regarded as a crucial predictor of mortality in patients with chronic obstructive pulmonary disease (COPD). However, the situation has changed over the past 10 years. Various systemic clinical outcome measurements, such as exercise capacity, dyspnoea, health status, etc., have been found to be assoc...