| Group | Females | Males | ||||||
| FEV1 | FVC | FEV1/FVC | FEF25–75% | FEV1 | FVC | FEV1/FVC | FEF25–75% | |
| African–American | -13.8 | -14.4 | 0.6 | -11.7 | -14.7 | -15.5 | 0.8 | -12.9 |
| North East Asian | -0.7 | -2.1 | 1.1 | -7.7 | -2.7 | -3.6 | 0.9 | -3.2 |
| South East Asian | -13.0 | -15.7 | 2.9 | -4.3 | -9.7 | -12.3 | 2.8 | -0.9 |
FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; FEF25–75%: forced expiratory flow at 25–75% of FVC.