Table 4 Correlations between CAT and mMRC in each COPD group (A–D) and combined COPD groups when categorised based on GOLD 2011

From: Features of COPD patients by comparing CAT with mMRC: a retrospective, cross-sectional study

 

Assignment by CAT

Assignment by mMRC

 

Number (%)

Pearson’s correlation

Number (%)

Pearson’s correlation

Individual COPD group

 A

232 (30.6)

r=0.010

P=0.879

168 (22.2)

r=0.189

P=0.014*

 B

133 (17.6)

r=0.401

P=0.000*

197 (26.0)

r=0.431

P=0.000*

 C

168 (22.2)

r=−0.060

P=0.437

120 (15.9)

r=0.465

P=0.000*

 D

224 (29.6)

r=0.462

P=0.000*

272 (35.9)

r=0.415

P=0.000*

Combined COPD group

 A+C

400 (52.8)

r=−0.018

P=0.713

288 (38.0)

r=0.357

P=0.000*

 B+D

357 (47.2)

r=0.460

P=0.000*

469 (62.0)

r=0.446

P=0.000*

 A+B

365 (48.2), r=0.391, P=0.000*

 C+D

392 (51.8), r=0.480, P=0.000*

All

757 (100.0), r=0.480, P=0.000*

  1. Abbreviations: CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease; GOLD, Global initiative for Chronic Obstructive Lung Disease; mMRC, modified Medical Research Council dyspnoea scale. *P<0.05.
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