Table 2.
Demographics of COPD patients by the GOLD 2011 grouping system
| Total
|
Group A
|
Group B
|
Group C
|
Group D
|
P-value | |
|---|---|---|---|---|---|---|
| N=1,053 (100%) |
n=194 (18.4%) |
n=428 (40.6%) |
n=71 (6.7%) |
n=360 (34.2%) |
(among A, B, C, D) | |
| Age (years) | 72.8±9.6 | 70.7±10.1 | 74.6±9.6 | 69.8±8.6 | 72.5±9.2 | <0.001 |
| BMI (kg/m2) | 23.4±3.9 | 23.8±3.3 | 24.0±4.1 | 23.0±3.5 | 22.5±3.8 | <0.001 |
| Male | 995 (94.5%) | 182 (93.8%) | 400 (93.5%) | 69 (97.2%) | 344 (95.6%) | 0.42 |
| FEV1 | 1.33±0.57 | 1.71±0.48 | 1.53±0.60 | 1.08±0.33 | 0.96±0.34 | <0.001 |
| FEV1 %pred | 58.5±20.5 | 72.4±15.3 | 69.0±17.2 | 44.9±15.1 | 42.0±13.1 | <0.001 |
| mMRC score | 1.8±1.0 | 0.8±0.4 | 2.1±0.6 | 0.9±0.5 | 2.4±0.9 | <0.001 |
| CAT score | 11.3±7.2 | 5.3±2.4 | 12.4±6.5 | 5.3±2.5 | 14.4±7.7 | <0.001 |
| Exacerbation rates | 0.60±1.16 | 0.13±0.34 | 0.19±0.40 | 1.00±1.25 | 1.27±1.60 | <0.001 |
| Smoking history | 0.32 | |||||
| Never | 97 (9.5%) | 14 (7.5%) | 44 (10.6%) | 6 (8.7%) | 33 (9.4%) | |
| Former | 590 (57.8%) | 99 (52.9%) | 235 (56.6%) | 43 (62.3%) | 213 (60.9%) | |
| Pack-years | 42.8±29.2 | 45.6±32.3 | 46.4±31.0 | 48.9±33.6 | 48.9±32.4 | |
| Current | 334 (32.7%) | 74 (39.6%) | 136 (32.8%) | 20 (29.0%) | 104 (29.7%) | |
| Pack-years | 52.2±33.2 | 45.6±33.0 | 47.1±29.5 | 41.8±26.0 | 49.1±31.1 |
Abbreviations: FEV1, forced expiratory volume in the first second; FEV1%pred, the percentage of FEV1 of the predicted value; mMRC, modified Medical Research Council; CAT, COPD assessment test.