Concordance and disconcordance of rates of pre- and post-bronchodilator airflow obstruction in all study subjects#
| Post-bronchodilator FEV1/FVC | Total | ||
| Obstruction¶ | No obstruction+ | ||
| Pre-bronchodilator FEV1/FVC | |||
| Obstruction¶ | 3390 | 1149 | 4539 |
| No obstruction+ | 196 | 9321 | 9517 |
| Total | 3586 | 10470 | 14056 |
Data are presented as n. FEV1: forced expiratory volume in one second; FVC: forced vital capacity. #: n = 14,056; ¶: FEV1/FVC of <0.70; +: FEV1/FVC of ≥0.70.