Table 1– Demographic details and health status of patients with chronic obstructive pulmonary disease (COPD) and control subjects

	COPD	Control subjects	p-value
Demographics
Subjects n	10	10
Age yrs	66.8±7.5	64.7±12.4
Males	100	100
Height m	1.76±0.05	1.77±0.08	ns
Weight kg	85.4±12.4	90.1±21.2	ns
Body mass index kg·m⁻²	27.6±3.2	28.3±4.6	ns
Current smoker	10	0
Former smoker	90	90
Pack-yrs	46.5±18.3	23.9±12.2	0.006
GOLD classification
I	20	0
II	50	0
III	30	0
IV	0	0
Lung function
FVC % pred	77±18	86±9	ns
FEV₁ % pred	62±20	86±8	0.008
FEV₁/FVC % pred	60±9	79±9	0.001
Total lung capacity % pred	100±13	90±11	ns
Residual volume % pred	151±29	106±17	0.003
Blood parameters
C-reactive protein mg·dL⁻¹	0.46±0.31	0.50±0.28	ns
White blood cell count cells·L⁻¹	8.14±3.34	7.22±2.70	ns
Coronary artery disease
1 vessel	30	10
2 vessels	0	10
3 vessels	70	80

Data are presented as mean±sd or %, unless otherwise stated. GOLD: Global Initiative for Chronic Obstructive Lung Disease; FVC: forced vital capacity; % pred: % predicted; FEV₁: forced expiratory volume in 1 s; ns: not significant.