| Large size UBCs | Medium size UBCs | Small size UBCs | All the UBCs |
Mean | 0.829 | 0.589 | 0.881 | 0.782 |
Median | 0.895 | 0.521 | 0.906 | 0.870 |
Minimum | 0.542 | 0.352 | 0.661 | 0.352 |
Maximum | 0.981 | 0.954 | 0.951 | 0.981 |
Coefficient of variation (CoV) | 0.159 | 0.342 | 0.094 | 0.233 |
N | 52 | 26 | 26 | 104 |