Ultrasound | Diameter (mm) | ||
---|---|---|---|
Male fetus (n = 99) | Female fetus (n = 81) | p | |
Pre-pregnancy | 23.7 ± 11.7 | 23.5 ± 12.8 | 0.92* |
Early first trimester | 27.4 ± 11.0 | 33.5 ± 13.3 | < 0.01* |
Late first trimester | 34.6 ± 11.7 | 40.2 ± 13.9 | < 0.01* |
Second trimester | 34.7 ± 10.3 | 40.5 ± 14.9 | < 0.01* |
Third trimester | 39.1 ± 13.2 | 37.0 ± 11.9 | 0.29 |
p | < 0.01^ | < 0.01^ | – |