Table 2.

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

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)

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.