Table 5 B-IBI health assessment grade of the sampling sites.

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

Health grade

Excellent (M ≥ 6.54)

Good (4.91 ≤ M < 6.54)

Fair (3.27 ≤ M < 4.91)

Poor (1.64 ≤ M < 3.27)

Very poor (M < 1.64)

Number

9

23

49

78

16

Percentage

5.14

13.14

28.00

44.57

9.14

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