Item No.

1

2

3

4

5

6

7

8

9

10

11

12

13

Item symbol

W

I

R

PCR

Nt

P

Se

De

V

T

Pr

H

AP

Level 1

5.57

5.53

4.82

4.57

7.72

6.56

5.54

7.32

5.01

6.31

4.71

6.42

4.87

Level 2

5.46

5.51

6.21

6.46

3.31

2.94

5.49

5.22

6.02

4.72

6.32

4.62

6.16

Contribution (db)

0.11

0.02

−1.39

−1.89

4.41

3.62

0.05

2.10

−1.01

1.59

−1.61

1.80

−1.29

Integrated estimate SN ratio

13.7 db

Infectious disease feature items

10.2 db

Contribution of positive rate (P) and needs treatment (Nt)

8.03 db

Contribution of environmental items

3.5 db

Ratio of infectious disease items to the integrated estimate SN ratio

75%

Ratio of P and Nt items to the integrated estimate SN ratio

59%

Ratio of environmental items to the integrated estimate SN ratio

25%