| Total number of the patients evaluated for etiological factors = 592 | ||
| ETIOLOGICAL FACTORS | Number | % |
| Genetics | 138 | 23.3 |
| Consanguineous Marriage | 156 | 26.3 |
| Drugs used in first trimester | 252 | 42.5 |
| Other etiological factors | 46 | 7.7 |