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Table 3 The proper threshold Px selection for each infectious disease (e.g., chickenpox) based on the CIDARS, Songjiang District of Shanghai, China

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)

Px Values based on the ‘mean + 2SD’ Evaluation indexes
A B C D Se (%) Sp (%) YI (%) CR(%)
P40 1 22 0 29 100.00 56.86 56.86 57.69
P45 1 20 0 31 100.00 60.78 60.78 61.54
P50 1 16 0 35 100.00 68.63 68.63 69.23
P55 1 13 0 38 100.00 74.51 74.51 75.00
P60 1 11 0 40 100.00 78.43 78.43 78.85
P65 1 6 0 45 100.00 88.24 88.24 88.46
P70 1 6 0 45 100.00 88.24 88.24 88.46
P75 1 5 0 46 100.00 90.20 90.20 90.38
P80 0 4 1 47 0.00 92.16 −7.84 90.38
P85 0 4 1 47 0.00 92.16 −7.84 90.38
P90 0 3 1 48 0.00 94.12 −5.88 92.31
P95 0 2 1 49 0.00 96.08 −3.92 94.23