TABLE 4

Test characteristics

Sensitivity %Specificity %PPV %NPV %
FeNO ≥57 ppb30884580
BMI ≤23.05 kg·m−220914177
FeNO ≥57 ppb and BMI ≤23.05 kg·m−21510010078

PPV: positive predictive value; NPV: negative predictive value; FeNO: fraction of exhaled nitric oxide; BMI: body mass index.