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Of bombers, radiologists, and cardiologists: time to ROC. P Collinson.Heart1998;80:215−17.

The calculation of prevalence and likelihood ratio should been (TP, true positive; TN, true negative; FP, false positive; FN, false negative):

Prevalence: (TP+FN)/(TP+FN+TN+FP)

Likelihood ratio: [TP/(TP+FN)]/[1 − TN/(TN+FN)]

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