| Correlation coefficient range | Strength of correlation |
| 1.00 | Perfect correlation |
| 0.76 to 0.99 | Very strong |
| 0.51 to 0.75 | Strong |
| 0.26 to 0.50 | Moderate |
| 0.01 to 0.25 | Very weak |
| 0.00 | No correlation |