Table 2 Classification of coupling coordination levels.

From: Analysis and forecast of the coupled development level of socioeconomy ecological environment and tourism in China’s Yellow River Basin

Interval of D-values for coupling coordination

Level of coordination

Degree of coupling coordination

(0.0 ~ 0.1)

1

Extreme disorder

[0.1 ~ 0.2)

2

Severe disorder

[0.2 ~ 0.3)

3

Moderate disorder

[0.3 ~ 0.4)

4

Mild disorder

[0.4 ~ 0.5)

5

On the verge of becoming dysfunctional

[0.5 ~ 0.6)

6

Sue For coordination

[0.6 ~ 0.7)

7

Primary coordination

[0.7 ~ 0.8)

8

Intermediate level coordination

[0.8 ~ 0.9)

9

Good coordination