Predictors | AUC | Sensitivity % | Specificity % | PPV % | NPV % | p-value |
FeNO | ||||||
ΔFeNO (diurnal) | 0.803 (0.715–0.891) | 64.3 | 95.5 | 94.7 | 67.7 | <0.001 |
FeNO (daily) | 0.582 (0.470–0.695) | 42.6 | 72.7 | 66.7 | 50 | 0.162 |
ΔFeNO (week) | 0.789 (0.699–0.878) | 67.9 | 86.4 | 86.4 | 67.9 | <0.001 |
%FeNO (week) | 0.721 (0.619–0.824) | 85.7 | 54.5 | 70.6 | 75.0 | <0.001 |
FeNO (min/max %) | 0.720 (0.615–0.825) | 82.1 | 63.6 | 74.2 | 73.7 | <0.001 |
PEF | ||||||
ΔPEF (diurnal) | 0.527 (0.407–0.646) | 35.7 | 100 | 100 | 55 | 0.659 |
PEF (daily) | 0.735 (0.637–0.833) | 57.1 | 77.3 | 76.2 | 58.6 | <0.001 |
ΔPEF (week) | 0.619 (0.505–0.733) | 53.6 | 81.8 | 78.9 | 58.1 | 0.048 |
%PEF (week) | 0.741 (0.641–0.840) | 60.7 | 81.8 | 81.0 | 62.1 | <0.001 |
PEF (min/max %) | 0.741 (0.641–0.840) | 60.7 | 81.8 | 81.0 | 62.1 | <0.001 |
ACQ score | 0.772 (0.677–0.867) | 71.4 | 86.4 | 87.0 | 70.4 | <0.001 |
Combination | ||||||
ΔPEF (min/max %)+ACQ | 0.816 (0.733–0.900) | 64.3 | 90.9 | 90.0 | 66.7 | <0.001 |
ΔFeNO (diurnal)+ACQ | 0.914 (0.857–0.971) | 85.7 | 86.4 | 88.9 | 82.6 | <0.001 |
Data are presented as mean (95% confidence interval), unless otherwise stated. AUC: area under the curve; PPV: positive predictive value; NPV: negative predictive value; FeNO: exhaled nitric oxide fraction; ΔFeNO: change in FeNO; min/max %: minimum as a percentage of maximum; PEF: peak expiratory flow; ΔPEF: change in PEF; ACQ: asthma control questionnaire.