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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