Table 2

Subjects’ demographic and clinical characteristics
Variables Healthy controls (n = 47) COPD patients (n = 47) P-value
Age (years) 58.8 ± 4.6 61.3 ± 4.5 0.011*
Sex 1.000
Males 40 (85.1%) 40 (85.1%)
Females 7 (14.9%) 7 (14.9%)
Smokers 24 (51.1%) 24 (51.1%) 1.000
Smoking history (pack/year) § 31.9 ± 7.4 31.7 ± 6.0 0.755
FEV1/FVC %†, § 86.6 ± 4.5 56.8 ± 5.3 <.001*
FEV1,% Reference†, § 103.1 ± 9.5 59.4 ± 6.3 <.001*
ISAB as needed 0 (0) 30 (63.8) -
ILAB regularly 0 (0) 18 (38.3) -

Abbreviations: COPD: chronic obstructive pulmonary disease; ISAB: inhaled short-acting bronchodilators; ILAB: inhaled long-acting bronchodilators.

†,‡,§ Results are means ± SDs for †,§continuous variables and n (%) for categorical variables.

†‡§ Groups were compared using two-sample t-test or §Mann–Whitney U test if data were not normally distributed. Pearson Chi-square test was used for categorical variables.

* P < 0.05, significantly different between groups.

Zhang et al.

Zhang et al. Diagnostic Pathology 2012 7:65   doi:10.1186/1746-1596-7-65

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