Distribution of self-rated health and association with clinical parameters in patients with chronic obstructive pulmonary disease
BACKGROUND: Data on self-rated health (SRH) in patients with chronic obstructive pulmonary disease (COPD) are very limited; we therefore initiated this study to investigate the distribution of SRH and association with established parameters of disease severity. PATIENTS AND METHODS: We included 135 clinically stable patients with COPD (64 ± 8 years, 71% men, GOLD stage: II –59; III –55; IV –21) and 25 healthy control persons. SRH was evaluated using the 5-grade Likert scale (1-very poor to 5-very good). RESULTS: Patients with COPD had poorer SRH when compared with controls (3.0 ± 0.7 vs. 3.8 ± 0.6, P < 0.001). SRH decreased over GOLD stage (P = 0.016) and 27 (20%) patients reported poor or very poor SRH. In univariate analysis, GOLD stage (P = 0.022), Center for Epidemiologic Studies Depression (CES-D) score (P = 0.001), BODE index score (P < 0.001), score on the modified Medical Research Council (MMRC) dyspnea scale (P < 0.001) and 6-minute walk test (6MWT) distance (P < 0.001) determined poor or very poor SRH. In a multivariate model which included BODE index score, a CES-D score ≥ 16 (P = 0.013) and BODE index score (P = 0.012) determined poor or very poor SRH. In the model with individual components of the BODE index, a CES-D score ≥ 16 (P = 0.012), MMRC score of 3 or 4 (P = 0.019) and 6MWT distance ≤ 249 m (P = 0.019) determined poor or very poor SRH. CONCLUSION: In patients with COPD, SRH is worse than in healthy control persons and deteriorates over GOLD stage. Perception of health as poor or very poor is associated with psychological components (CES-D score) and disease severity (BODE index score, 6MWT distance and MMRC dyspnea score).