Correlations between HRQL instruments and with GOLD grade and BODE as clinical measures: Spearman Correlation Coefficients. Table S2. Adjusted mean EQ-5D utilities, EQ-5D VAS, CAT score, SGRQ total scores for COPD grade 1–4 stratified for group with low (≤3) or high (>3) number of comorbidities. Table S3. Results of regression models considering interactions between COPD grades and low/high number of comorbidity. Figure S1. Lifetime prevalence of self-reported comorbidities (%) in the study population. Figure S2. HRQL scores by FEV1 % pred.: non-parametric quantile regression: quantile fit plots for FEV1 % pred. (DOC 258 kb)