| Gestational age (weak) | Group | Frequency | Percentage (%) |
| 25 - 30 | Preeclampsia | 10 | 20 |
| Normal pregnant | 10 | 20 | |
| 31 - 35 | Preeclampsia | 25 | 50 |
| Normal pregnant | 17 | 34 | |
| 36 - 40 | Preeclampsia | 15 | 30 |
| Normal pregnant | 23 | 46 |