Table 4—

Concordance and disconcordance of rates of pre- and post-bronchodilator airflow obstruction in all study subjects#

Post-bronchodilator FEV1/FVCTotal
ObstructionNo obstruction+
Pre-bronchodilator FEV1/FVC
 Obstruction339011494539
 No obstruction+19693219517
Total35861047014056
  • 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.