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Comparison of findings referring to bifurcation after classification by types.
| Authors | Type I | Type II | Type III | Type IV | Type V |
| Dellon (1984) | 22.58% | 54.84% | 16.13% | 6.45% | - |
| Heimkes (1987) | 100% | - | - | - | - |
| Havel (1988) | 45.59% | 38.24% | 8.82% | 7.35% | - |
| Louisia (1999) | 37.7% | 28.6% | 7.1% | 28.6% | - |
| Ndiaye (2003) | - | 90% | 10% | - | |
| Bilge (2003) | 84% | 12% | - | 4% | |
| Joshi (2006) | 85.2% | 14.7% | 0.89% | - | - |
| Fernandes(2006) | 23.34% | 33.33% | 30% | 10% | 3.33% |
| Present study (2011) | 52% | 14% | 22% | 12% | - |
