Comparisons of spirometry classifications using the two techniques
| Based on FVC | Total | |||
| Normal | Obstruction | Restriction | ||
| Based on FEV6 | ||||
| Normal | 862 | 8 | 8 | 878 |
| Obstruction | 14 | 152 | 2 | 168 |
| Restriction | 6 | 5 | 82 | 93 |
| Total | 882 | 165 | 92 | 1139 |
Data are presented as n. FVC: forced vital capacity; FEV6: forced expiratory volume in six seconds.