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Logo of bmcmrmBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Medical Research Methodology
 
From:
Published online 2012 March 31. doi: 10.1186/1471-2288-12-40

Table 1

Baseline characteristics of the study participants

Entire cohort
(n = 133)
COPD
(n = 88)
Controls
(n = 45)
p value*
Male sex111 (83.5%)81 (92%)30 (66.7%)< 0.001
Age (years)62.5 (9.2)65.4 (7.8)56.9 (9.2)< 0.001
BMI (kg/m2)27.6 (5)27.6 (5)27.6 (4.9)NS
Smoking (pack-yr)56.4 (25.9)62.2 (25)45.3 (24.3)< 0.001
Charlson-age3.11 (1.5)3.7 (1.2)1.8 (1.4)< 0.001
Exhaled CO (ppm)8.5 (9.7)6.5 (7.7)13.9 (12.4)0.015
FVC (%)92.7 (17.4)92.7 (19)92.8 (13.8)NS
FEV1 (%)69.1 (23.4)58.9 (20.5)90 (12.8)< 0.001
Dyspnea (MRC)0.86 (0.67)0.97 (0.68)0.64 (0.6)0.009

Data expressed as mean (standard deviation) or absolute (relative) frequencies, as appropriate. *Data were analyzed using Student's t test or the χ2 test, as appropriate.

FVC: Forced vital capacity. FEV1: Forced expiratory volume in 1 second. BMI: body mass index. CO: carbon monoxide. MRC: Medical Research Council scale.