Biometric ultrasound measurements.

Ultrasound measurements of fetal head circumference, abdominal circumference and femur length measured at two times in the third trimester. Fetal growth was calculated as the difference between measurements at gestational weeks 30–32 and 36–38, respectively.N varies due to missing numbers.Measurements of head circumference, abdominal circumference and femur length are given in mm and reported as means and SD.*Z-scores calculated according to Norwegian referance charts (19).The differences between visit 3 and visit 4 are given as differences in mm or grams and as difference in z-scores or percentiles.