Table 1 Distribution of candidate metricvalues in the reference sites.

From: Health assessment of important tributaries of Three Georges Reservoir based on the benthic index of biotic integrity

Metric serial no

Mean

SD

Minimum value

Maximum value

25% quantile

Median

75% quantile

M1

27.93

7.81

13.00

45.00

22.00

28.00

30.00

M2

12.80

4.74

6.00

24.00

10.00

11.00

17.00

M3

4.73

3.10

0.00

10.00

2.00

4.00

7.00

M4

9.07

3.33

5.00

18.00

7.00

8.00

11.00

M5

0.47

0.99

0.00

3.00

0.00

0.00

0.00

M6

3.20

1.66

1.00

6.00

2.00

3.00

5.00

M7

6.20

3.84

1.00

14.00

4.00

6.00

8.00

M8

4.40

3.36

0.00

12.00

2.00

3.00

7.00

M9

0.65

0.28

0.11

0.96

0.52

0.70

0.87

M10

0.15

0.18

0.00

0.52

0.01

0.04

0.27

M11

0.42

0.26

0.04

0.86

0.13

0.46

0.63

M12

0.00

0.01

0.00

0.04

0.00

0.00

0.00

M13

0.21

0.17

0.02

0.47

0.04

0.20

0.38

M14

0.14

0.12

0.00

0.38

0.04

0.11

0.17

M15

0.10

0.12

0.00

0.33

0.01

0.04

0.17

M16

0.00

0.00

0.00

0.01

0.00

0.00

0.00

M17

3.13

0.72

1.49

3.94

2.62

3.23

3.69

M18

9.53

3.81

5.00

17.00

7.00

8.00

10.00

M19

2.07

1.10

0.00

4.00

2.00

2.00

3.00

M20

0.31

0.12

0.17

0.59

0.24

0.27

0.32

M21

0.61

0.13

0.42

0.85

0.48

0.63

0.73

M22

0.01

0.03

0.00

0.08

0.00

0.00

0.00

M23

0.51

0.15

0.32

0.82

0.33

0.53

0.63

M24

0.28

0.15

0.07

0.56

0.18

0.26

0.38

M25

0.14

0.10

0.03

0.32

0.06

0.12

0.25

M26

0.05

0.06

0.00

0.24

0.02

0.03

0.05