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Table 1 Head circumference (HC), Abdominal circumference (AC), Femur length (FL) and Estimated Fetal Weight (EFW) values expressed as mean and SD of Z-scores according to the two different GA estimation [20, 21] and paired t-test comparison

From: The impact of optimal dating on the assessment of fetal growth

  Robinson-based GA assessment Intergrowth-based GA assessment Within-subject differencesa: Mean (SD) p value
Head circumference (HC)
(n = 3522)
−0.0251 (1.057) − 0.1484 (1.056) −0.1251 (0.075) < 10− 4
Abdominal circumference (AC)
(n = 3522)
0.4808 (0.990) 0.3675 (0.979) −0.1150 (0.065) < 104
Femur length (FL)
(n = 3522)
0.5236 (1.021) 0.3989 (1.021) −0.1267 (0.072) < 10−4
Estimated foetal weight (EFW)
(n = 3522)
0.4424 (1.008) 0.2898 (1.005) −0.1548 (0.090) < 10−4
  1. a Mean (SD) for each biometric measurement were calculated by subtracting the value obtained using the Robinson dating formula from the value obtained using the Intergrowth dating formula within-person and then taking the mean and SD of these differences