Group and sub-group analysis of data
| n | FEV1 | VC | FEV1/TLC | |
| Entire Group | 806 | 2.85 ± 0.12 | 3.15 ± 0.04 | 0.52 ± 0.01 |
| 1: Normal | 175 | 3.85 ± 0.07 | 4.35 ± 0.10 | 0.68 ± 0.01 |
| 2: Airways Obstruction | 415 | 1.65 ± 0.06 | 3.75 ± 0.05 | 0.29 ± 0.01 |
| 3: Restrictive Defect | 174 | 1.95 ± 0.07 | 2.55 ± 0.03 | 0.52 ± 0.01 |
| 4: Mixed Defect | 42 | 1.65 ± 0.12 | 2.65 ± 0.17 | 0.27 ± 0.02 |
Data are given as mean ± SEM.