Table 4. Correlations between CAT and mMRC in each COPD group (A–D) and combined COPD groups when categorised based on GOLD 2011.
|
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* |
|||
| |
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| All | 757 (100.0), r=0.480, P=0.000* | |||
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.