| 0.8 | ≤ |rho| ≤ | 1 | High |
| 0.6 | ≤ |rho| < | 0.8 | Good |
| 0.4 | ≤ |rho| < | 0.6 | Moderate |
| 0.2 | ≤ |rho| < | 0.4 | Weak |
| |rho| < | 0.2 | Poor |
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