Table 1. Description of different parameters within healthy villi.
Abbreviation: SD, standard deviation.
| Healthy Villi | |||||||
| Parameter | Min | Max | Mean | SD | Median | 25th percentile | 75th percentile |
| The placental barrier thickness (µ) | 10.6 | 809.1 | 128.9 | 126.8 | 101.2 | 53.7 | 161.6 |
| The number of Hofbauer cells | 0.0 | 5.0 | 2.5 | 1.3 | 2.0 | 2.0 | 3.0 |
| The surface area of the blood vessels (μ2) | 12895.1 | 523957.5 | 107338.0 | 105474.8 | 68531.9 | 30635.1 | 125385.4 |
| The perimeters of the blood vessels (µ) | 441.0 | 8202.8 | 1959.2 | 1780.6 | 1214.8 | 842.1 | 2419.0 |
| The number of the blood vessels | 0.0 | 8.0 | 3.1 | 2.1 | 3.0 | 2.0 | 4.0 |
| The surface area of the villous (μ2) | 195624.2 | 2395629.3 | 989101.6 | 519510.5 | 836488.7 | 637191.4 | 1483223.2 |
| The placental barrier thickness/perimeters of the villous blood vessels ratio | 0.721591 | 53.176290 | 17.690717 | 13.242211 | 13.513306 | 7.526904 | 28.527810 |
| The placental barrier thickness/surface area of the blood vessels ratio | 0.000650 | 1.677623 | 0.273575 | 0.423930 | 0.045728 | 0.013159 | 0.286780 |
| The number of Hofbauer cells/surface area of the villous ratio | 0.000074 | 0.211817 | 0.005724 | 0.033870 | 0.000284 | 0.000196 | 0.000364 |
| The number of the blood vessels/surface area of the villous ratio | 0.000001 | 0.000008 | 0.000004 | 0.000002 | 0.000004 | 0.000003 | 0.000004 |
| The surface area of the blood vessels/surface area of the villous ratio | 0.015626 | 0.425395 | 0.128724 | 0.111073 | 0.105644 | 0.030182 | 0.190623 |
| The perimeters of the blood vessels/surface area of the villous ratio | 0.000000 | 0.000162 | 0.000032 | 0.000036 | 0.000023 | 0.000013 | 0.000039 |