Table 1.
Baseline characteristics of the study population
| Variables | Patients with COPD(273 cases) |
|---|---|
| Male, n(%) | 174(63) |
| Age (yr) | 77(8,51 ~ 90) |
| Risk factors | |
| Smokers, n(%) | 224(82) |
| Smoking index (pack-yr) | 43(23,10 ~ 120) |
| Biomass fuel exposure, n(%) | 42(15) |
| Biomass fuel exposure history (yr) | 27(7,10 ~ 40) |
| Occupational dust exposure, n(%) | 37(14) |
| Occupational dust exposure history (yr) | 25(10,10 ~ 40) |
| History of chronic cough/sputum (yr) | 19(12,2 ~ 50) |
| History of dyspnea (yr) | 6.1(5.0,0 ~ 20) |
| Ratio of dyspnea history to chronic cough/sputum history | 0.32(0.21,0 ~ 1) |
| Occurrence of wheezing, n(%) | 214(78) |
| FEV1/FVC% | 46(11,22 ~ 69) |
| FEV1%predicted | 41(13,14 ~ 79) |
| GOLD stage | |
| Stage II, n(%) | 73(26.8) |
| Stage III, n(%) | 131(47.9) |
| Stage IV, n(%) | 69(25.3) |
| Serum T-IgE (kU/L) | 401(916,2 ~ 7420) |
Continuous data expressed as mean (standard deviation, range).
Categorical data expressed as number (percentage).
Definition of abbreviations: FEV1: Forced expiratory volume in 1 second, FVC: Forced vital capacity.