Change in FEV1(%) | Predictive value | ||||||
<15% | ⩾15% | Negative | Positive | Sensitivity | Specificity | ||
Nitric oxide | |||||||
<10 ppb | 18 | 7 | 72% | 59% | |||
⩾10 ppb | 2 | 10 | 83% | 90% | |||
Sputum eosinophilia | |||||||
<4% | 13 | 6 | 68% | 54% | |||
⩾4% | 4 | 7 | 64% | 76% | |||
Increased NO and/or eosinophil count | |||||||
No | 15 | 4 | 79% | 76% | |||
Yes | 5 | 13 | 72% | 75% |