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Table 2 Proper threshold selection method and evaluation indexes for the performance of Px

From: How to select a proper early warning threshold to detect infectious disease outbreaks based on the China infectious disease automated alert and response system (CIDARS)

Outbreak signals of Px Outbreak Gold Standard ‘mean + 2SD’ Total
1 0
1 A B R1
0 C D R2
Total C1 C2 N
  1. Sensitivity, Se = A/C1; Specificity, Sp = D/C2; Youden’s Index, YI = Se + Sp-1; Consistency Rate, CR = (A + D)/N