| Indicators | Morphometric indicators of placenta at normal pregnancy | ||||||
| N | M | SD | SE | Min | Max | Range | |
| The length of the placenta | 695 | 18.518 | 1.468 | 0.056 | 14.00 | 23.00 | 9.00 |
| Width of the placenta | 695 | 18.150 | 1.565 | 0.059 | 12.00 | 23.00 | 11.00 |
| The thickness of the placenta | 695 | 1.997 | 0.388 | 0.015 | 0.80 | 4.00 | 3.20 |
| Mass of placenta | 695 | 628.45 | 86.298 | 3.273 | 310.0 | 880.0 | 570.0 |