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Table 1 Schematic outcomes of a test

From: Silent coronary artery disease in type 2 diabetes mellitus: the role of Lipoprotein(a), homocysteine and apo(a) polymorphism

TEST CAD n NO CAD n
Positive True positive a False positive c
Negative False negative b True negative d
  1. Sensitivity = a / (a+b); specificity = d / (c+d); positive predictive value = a / (a+c) Negative predictive value = d / (b+d)