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Spirometry results for three subjects with obstruction.
| Group | FEV1/FVC | FEV1/ FVC LLN |
Z | FEV1 | FEV1 pred | FEV25–75 | FEV25–75 LLN | Z | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | B | 0.68 | 0.75 | –2.39 | 1.56 | 65% | 1.41 | 1.91 | –2.55 |
| 2 | B | 0.75 | 0.75 | –1.67 | 3.56 | 98% | 3.52 | 2.72 | –0.67 |
| 3 | K | 0.66 | 0.74 | –2.48 | 3.11 | 87% | 2.43 | 2.58 | –1.84 |
FEV1, forced expiratory volume at 1 s; LLN, lower limit of normal; Z, Z score; pred, predicted value; FVC, forced vital capacity; FEV25–75, forced expiratory flow between 25% and 75% of forced vital capacity.
