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Illustration of a contingency table. (A) For a certain statistical threshold, true-positive (TP) or false-negative (FN) cases are determined in patients, false-positive (FP) or true-negative (TN) cases in control subjects. (B) Sensitivity (number of true positives over the number of true positives and false negatives) was defined solely in the patient group and specificity (number of true negatives over the number of true negatives and false positives) solely in the control group.
