Skip to main content

Table 2 Spearman rank correlations between health status questionnaires (CAT, CCQ, SGRQ), lung function, GOLD stage, MRC dyspnea scale, 6MWT and BODE-index at baseline

From: Assessing health status in COPD. A head-to-head comparison between the COPD assessment test (CAT) and the clinical COPD questionnaire (CCQ)

  CAT CCQ Total CCQ Symptom CCQ Mental CCQ Functional SGRQ Total SGRQ Symptom SGRQ Activity SGRQ Impact GOLD stage FEV1% pred
CAT 1 0.644** 0.540** 0.438** 0.616** 0.646** 0.404** 0.629** 0.662** 0.337** −0.353**
CCQ            
Total 0.644** 1 0.867** 0.700** 0.932** 0.769** 0.502** 0.711** 0.703** 0.361** −0.410**
Symptom 0.540** 0.867** 1 0.542** 0.690** 0.629** 0.584** 0.516** 0.590** 0.275** −0.286**
Mental 0.438** 0.700** 0.542** 1 0.557** 0.529** 0.463** 0.448** 0.453** 0.222* −0.298**
Functional 0.616** 0.932** 0.690** 0.557** 1 0.733** 0.366** 0.753** 0.660** 0.376** −0.421**
SGRQ            
Total 0.646** 0.769** 0.629** 0.529** 0.733** 1 0.602** 0.830** 0.964** 0.474** −0.487**
Symptom 0.404** 0.502** 0.584** 0.463** 0.366** 0.602** 1 0.322** 0.533** 0.357** −0.357**
Activity 0.629** 0.711** 0.516** 0.448** 0.753** 0.830** 0.322** 1 0.740** 0.388** −0.403**
Impact 0.662** 0.703** 0.590** 0.453** 0.660** 0.964** 0.533** 0.740** 1 0.450** −0.443**
MRC 0.605** 0.739** 0.518** 0.435** 0.784** 0.690** 0.360** 0.736** 0.627** 0.372** −0.437**
dyspnea            
Scale            
6MWT −0.205(ns) −0.239* −0.170 (ns) −0.071(ns) −0.302** −0.281** −0.054 (ns) −0.365** −0.264* −0.255* 0.216**
BODE-index 0.483** 0.556** 0.433** 0.347** 0.545** 0.609** 0.413** 0.524** 0.577** 0.732** −0.705**
  1. *Correlations are significant at the 0.05 level ** Correlations are significant at the 0.01 level. ns = not significant. Lung function is expressed as FEV1%predicted. CAT = COPD assessment Test. CCQ = Clinical COPD Questionnnaire. SGRQ = St. George Respiratory Questionnaire. 6MWT = 6-minute walking test. MRC = Medical Research Council dyspnoea scale, BODE = body mass index, airflow limitation (forced expiratory volume in one second), dyspnoea and 6-min walk distance.