Table 9 Accuracy of Δ residual volume (RV) and Δ total lung capacity (TLC) in prediction of response based on forced vital capacity (FVC)
Δ RV% | Δ TLC% | |
|---|---|---|
Sensitivity | 78% | 50% |
Specificity | 29% | 70% |
Positive predictive value | 78% | 70% |
Negative predictive value | 29% | 85% |
Accuracy | 55% | 64% |
Cutoff point | > 18% | > 14% |
Area under curve | 0.54 | 0.50 |