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Risk group according to amount of vascularization and PI
| Low Risk | High Risk | Total | |
| Scanty Vascularization and PI > 0.82 | 5 (55.2%) | 4 (44.8%) | 9 |
| Scanty vascularization and PI < 0.82 or Abundant vascularization |
1 (5.6%) | 17 (94.4%) | 18 |
| Total | 6 | 21 | 27 |
