| Risk factor | Number | Percentage |
| Previous induced abortion | 120 | 59.4% |
| Pelvic inflammatory disease | 87 | 43.06% |
| Previous spontaneous abtion | 23 | 11.38% |
| Previous spontaneous abortion | 23 | 11.38% |
| Intra uterine contraceptive device | 21 | 10.39% |
| Previous ectopic pregnancy | 11 | 5.44% |