Table 1.
Demographic characteristics of study population
| Parameters | Non‐smoker | Smoker | COPD (GOLD I/II) |
|---|---|---|---|
| Subjects (male, n) | 15 | 15 | 15 |
| Age (Years) | 52.86 ± 14.61 | 57.38 ± 12.15 | 65.43 ± 8.34 |
| BMI (kg/m2) | 24.51 ± 3.24 | 23.96 ± 2.34 | 23.36 ± 2.72 |
| FEV1 (%) | 95.37 ± 12.79 | 90.59 ± 16.84 | 71.34 ± 13.53 |
| Post‐bronchodilator FEV1/FVC (%) | 80.70 ± 3.02 | 80.00 ± 6.52 | 63.96 ± 5.31 |
| Smoking index (pack‐years) | 0 | 31.40 ± 11.06 | 41.54 ± 19.19 |
Smoking index = average number of cigarettes per day (pack) × number of years of smoking history (years); BMI = weight (kilograms, kg)/ in square of height (square of metres, m2).
Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease guidelines.