Table 5.
Comparison of the prevalence of dyspnea (according to MRC dyspnea scale), chronic bronchitis, asthma, and wheeze in relation to different spirometric definitions of COPD
| Covariates (questionnaire-based) | All n=1,052 |
Non-COPD n=873 |
GOLD COPDFVC n=105 |
GOLD COPDVC n=173 |
GOLD COPDVC>FVC (n=68) |
|---|---|---|---|---|---|
| MRC grade 1 | 4.4% n=45 |
3.6% n=31 |
11.1%a n=11 |
8.6%a n=14 |
4.7% n=3 |
| MRC > grade 1 | 6.0% n=60 |
4.6% n=40 |
15.1%a n=15 |
12.2%a n=20 |
7.9% n=5 |
| Chronic bronchitis | 7.2% (n=76) |
6.5% (n=57) |
12.4%a n=13 |
10.4% n=18 |
7.3% n=5 |
| Physician-diagnosed asthma | 9.2% n=97 |
7.3% (n=64) |
21.9%a n=23 |
18.5%a n=32 |
13.2% n=9 |
| Wheeze | 8.6% n=90 |
5.6% (n=49) | 28.6%a n=30 |
23.1%a n=40 |
14.7% n=10 |
Note:
a
P<0.05, compared with non-COPD subjects.
Abbreviations: COPD, chronic obstructive pulmonary disease; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease; MRC, Medical Research Council; VC, vital capacity.