診斷準確性 Sensitivity, Specificity?

敏感性 (Sensitivity, positive in disease) = [TP/(TP+FN)] = True-positive rate = 1－false-negative rate
患病的這羣人裡，診斷試驗結果陽性者的比率。

特異性(Specificity, negative in health) = [TN/(TN+FP)] = True-negative rate = 1－false-positive rate
無病的這群人裡，試驗結果陰性者的比率

陽性預測值(Positive  predictive  value, PPV) = [TP/(TP+FP)]
診斷試驗結果陽性者患病的比率

陰性預測值(Negative predictive value, NPV) = [TN/(TN+FN)]
診斷試驗結果陰性者無病的比率

偽陽性率(False-positive rate, FPR) = [FP/(FP+TN)] = 1－Specificity

偽陰性率(False-negative rate, FNR) = [FN/(FN+TP)] = 1－Sensitivity

診斷準確性的測量與效果, 嘉義長庚醫院放射診斷科 翁旭惠 醫師