Figure 1.
Figure 2.
Groups of classification ranges of the indicator values: 0 and 1: first group of hazards; 2: second group of hazards; 3: third group of hazards; 4: fourth group of hazards; 5: fifth group of hazards
| 0 | lower outliers | 5 |
| 1 | < 25% | 4 |
| 2 | 25%–50% | 3 |
| 3 | 50%–75% | 2 |
| 4 | 75% | 1 |
| 5 | Upper outliers | 0 |
| 1 SET | 2 SET |