Table 2: Mid-expiratory flow FEF 25-75% predicted and absence of ventilatory limitation (Ventilatory reserve VR > 15%).
FEF 25-75% predicted | Sensitivity VR > 15% | Specificity VR > 15% | Positive predictive value VR > 15% | Negative predictive value VR > 15% |
> 50 | 75% | 71% | 90% | 45% |
> 40 | 84% | 61% | 88% | 52% |
> 30 | 91% | 53% | 87% | 62% |
> 20 | 96% | 33% | 83% | 68% |
> 10 | 99% | 11% | 80% | 73% |