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ROC analysis for blood eosinophil prediction of sputum eosinophil. Blood eosinophils at cutpoints from 50/µL (highest sensitivity) to 500/µL (lowest sensitivity) were examined for correct prediction of sputum eosinophils < or ≥1·25%. Although significant (p<0·001), the area under the curve (AUC) was only 0·63, demonstrating a lack of strength for the prediction. Maximum sensitivity and specificity were observed at a blood eosinophil cutpoint of 150/µL.
