Table 1.
Characteristics of cases and controls.
| Characteristic | Cases (N=410) | Controls (N=418) | P value |
|---|---|---|---|
| Age (years) | 44.02 ± 13.77 | 44.09 ± 13.75 | 0.944 |
| Male n (%) | 159 (38.78) | 162 (38.76) | 0.994 |
| BMI (kg/m2) | 23.06 ± 3.19 | 22.95 ± 3.34 | 0.634 |
| Smoking history n (%) | 76/403(18.86) | 55/262(20.99) | 0.58 |
| Age of asthma onset (years) | 33.69 ± 14.26 | - | - |
| FEV1% predicted | 81.36 ± 23.99 | - | - |
| FEV1/FVC % | 71.38 ± 14.85 | - | - |
| FVC % predicted | 95.63 ± 10.18 | - | - |
| Serum IgE (IU/ml) | 219.68 ± 412.59 | - | - |
Values are means ± standard deviation (SD) and absolute numbers (valid percentages). FEV1: forced expiratory volume in one second. FVC: forced vital capacity. IgE: immunoglobulin E. BMI: body mass index.