| Variables | Mean ± SD | Range | |
| Age (years) | 28.5 ± 5.9 | 19.0 - 43.0 | |
| LMP (week) | 35.0 ± 1.4 | 32.0 - 36.8 | |
| Trans-cerebellar diameter (mm) | 46.0 ± 3.5 | 38.2 - 51.7 | |
| Placental thickness (mm) | 39.6 ± 7.1 | 22.8 - 54.3 | |
|
| N | % | |
| Parity | Primiparous | 34 | 34.0 |
| Multiparous | 66 | 66.0 | |
| LMP week | Week-32 | 13 | 13.0 |
| Week-33 | 9 | 9.0 | |
| Week-34 | 16 | 16.0 | |
| Week-35 | 28 | 28.0 | |
| Week-36 | 34 | 34.0 | |