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Table 5 Correlations between mMRC and each item of CAT scores

From: Differences in classification of COPD group using COPD assessment test (CAT) or modified Medical Research Council (mMRC) dyspnea scores: a cross-sectional analyses

  mMRC
Spearman’s rho P value
Each item of CAT Cough .310** <.0001
  sputum .290** <.0001
  Chest tightness .345** <.0001
  dyspnea .731** <.0001
  activities .625** <.0001
  confidence .654** <.0001
  Sleep quality .381** <.0001
  Energy level .526** <.0001
  1. **Correlation is significant at the <0.01 level.