| Authors | Consanguinity (%) | Breech Presentation (%) | Family History (%) |
1. | Mufti (1988) [14] | 30 | 37.8 | NR |
2. | Al-Umran et al. (1988) [15] | NR | 13.6 | 6.8 |
3. | Mirdad (2002) [16] | 7.3 | 10 | 21.3 |
4. | Kremli et al. (2003) [10] | 49.3 | 11.4 | 43 |
5. | Alhunaishel et al. (2016) [18] | NR | 11 | 12.5 |
6. | Al-Anazi et al. (2017) [19] | 45 | 20 | 23.3 |