CAT score | Difference between classes | p-value | |
GOLD stage | |||
I | 16.2±8.8 | -0.1 | ns |
II | 16.3±7.9 | -3.0 | <0.0001 |
III | 19.3±8.2 | -3.0 | 0.0001 |
IV | 22.3±8.7 | ||
PCP-rated COPD severity | |||
Mild | 13.2±7.5 | -3.4 | <0.0001 |
Moderate | 16.6±7.6 | -4.7 | <0.0001 |
Severe | 21.3±8.1 | -3.5 | <0.0001 |
Very severe | 24.8±8.9 | ||
Mean total SGRQ score# | |||
≥0 and <30 | 9.4±5.0 | -5.6 | <0.0001 |
≥30 and <45 | 15.0±4.7 | -4.9 | <0.0001 |
≥45 and <60 | 19.9±5.3 | -7.8 | <0.0001 |
≥60 | 27.7±5.7 | ||
MRC dyspnoea grade | |||
1 | 11.7±6.8 | -4.0 | <0.0001 |
2 | 15.7±7.0 | -4.8 | <0.0001 |
3 | 20.5±7.5 | -2.9 | <0.0001 |
4 | 23.5±7.4 | -3.9 | <0.0001 |
5 | 27.3±8.3 |
Data are presented as mean or mean±sd, unless otherwise stated. COPD: chronic obstructive pulmonary disease; GOLD: Global Initiative for Chronic Obstructive Lung Disease; PCP: primary care practitioner; SGRQ: St George’s Respiratory Questionnaire; MRC: Medical Research Council; ns: nonsignificant. #: by SGRQ quartiles.