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Table 2 Demographic characteristics across COPD risk groups A-D and GOLD grades I-IV

From: Differences in classification of COPD patients into risk groups A-D: a cross-sectional study

Variable   Age [yrs] Male Number of comorbidities Current smokers
Classification N Mean ± SD N (%) Mean ± SD N (%)
CAT - Severity grades 87     
A 29 70.2 ± 8.5 15 (51.7) 2.1 ± 2.6 13 (44.8)
B 40 65.6 ± 10.6 21 (52.5) 2.5 ± 1.9 22 (55.0)
C + D 18 66.2 ± 8.4 15 (83.3) 1.9 ± 1.6 6 (33.3)
mMRC – Severity grades 79     
A 42 66.2 ± 9.4 21 (50.0) 2.1 ± 2.2 23 (54.8)
B 20 69.9 ± 12.0 11 (55.0) 2.6 ± 1.7 10 (50.0)
C + D 17 66.1 ± 8.6 14 (82.4) 1.8 ± 1.6 6 (35.3)
CAT - Exacerbations 87     
A 30 70.4 ± 8.4 16 (53.3) 2.1 ± 2.6 13 (43.3)
B 48 64.7 ± 10.0 30 (62.5) 2.4 ± 1.8 24 (50.0)
C + D 9 70.7 ± 7.9 5 (55.6) 2.0 ± 1.9 4 (44.4)
mMRC - Exacerbations 79     
A 48 65.8 ± 9.2 26 (54.2) 2.1 ± 2.1 20 (41.7)
B 22 68.5 ± 12.1 15 (68.2) 2.4 ± 1.6 9 (40.9)
C + D 9 70.7 ± 7.9 5 (55.6) 2.0 ± 1.9 4 (44.4)
GOLD grades 87     
I 23 67.5 ± 10.2 9 (39.1) 2.1 ± 2.5 11 (47.8)
II 46 67.6 ± 10.0 27 (58.7) 2.5 ± 2.0 24 (52.2)
III 12 66.2 ± 9.2 9 (75.0) 1.5 ± 1.4 6 (50.0)
IV 6 66.2 ± 7.1 6 (100.0) 2.7 ± 1.9 0 (0.0)
  1. CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease; GOLD, Global Initiative for Chronic Obstructive Lung Disease; mMRC, modified Medical Research Council; SD, standard deviation.