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. 2016 May 2;11:927–933. doi: 10.2147/COPD.S104644

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.