Table 2.
Characteristics of cases vs controls
| Variables | Subjects with airflow obstruction (cases) | Subjects without airflow obstruction (controls) | P-value |
|---|---|---|---|
| Sex, n (%) | |||
| Female | 154 (33.5%) | 306 (66.5%) | 0.9 |
| Male | 303 (33.3%) | 608 (66.7%) | |
| Age, years, mean ± SD | 63.2±7.4 | 57.9±6.2 | <0.001 |
| BMI, mean ± SD | 26±4.2 | 26.4±4 | 0.4 |
| Smoking status, n | |||
| Current | 263 | 635 | 0.0009 |
| Former | 194 | 279 | |
| Pack-years of smoking | |||
| Mean ± SD | 48.3±24.2 | 44±20.7 | 0.01 |
| FEV1 % | |||
| Mean ± SD | 80.4±19.1 | 101.4±14.2 | <0.0001 |
| FVC% | |||
| Mean ± SD | 104.2±18.3 | 104.8±17.2 | 0.1 |
| FEV1/FVC | |||
| Mean ± SD | 59.6±8.8 | 79.3±7.9 | <0.0001 |
Abbreviations: BMI, body mass index; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; FEV1/FVC, Tiffenau index; SD, standard deviation.