Table 2.
The demographic and clinical characteristics of clinical investigation subjects
| Variables | Healthy control group
|
COPD group
|
P-value | ||
|---|---|---|---|---|---|
| Nonsmokers | Smokers | Non-frequent exacerbators | Frequent exacerbators | ||
| Number | 32 | 18 | 18 | 32 | |
| Gender (male/female) | 24/8 | 14/4 | 14/4 | 27/5 | 0.461 |
| Age (years) | 60±10 | 59±8 | 62±7 | 64±8 | 0.691 |
| BMI (kg/m2) | 24.62±2.58 | 25.59±2.05 | 24.83±2.51 | 23.69±3.97 | 0.063 |
| Pack-years | – | 27.62±20.37 | 29.62±21.45 | 31.07±20.82 | <0.001 |
| Post-BD FEV1%pre | 96.25%±7.46% | 94.78%±8.72% | 45.74%±19.28% | 40.62%±18.41% | <0.001 |
Notes: Data are presented as mean ± SD. Pack-years = (the number of cigarettes smoked per day/20) × the number of years smoked.
Abbreviations: BD, bronchodilator; BMI, body mass index; FEV1%pre, forced expiratory volume in the first second of expiration for predicted values.