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Table 2 Number and percentage of Head circumference (HC), Abdominal circumference (AC), Femur length (FL) and Estimated Fetal Weight (EFW) classified as <3rd, < 10th, >90th and > 97th percentile according to the two difference GA estimation [20, 21]. The dataset is defined by the four cell totals a, b, c, and d for the dichotomous variables. The values in a (condition fulfilled) and d (condition not fulfilled) are the concordant cells; those in b and c are the discordant cellsa. p value given from the McNemar’s test

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

   Robinson-based GA assessment
n (%)
Intergrowth-based GA assessment
n (%)
a b c d p value
Head circumference (HC)
(n = 3522)
<3rd centile 112 (3.18) 135 (3.83) 112 23 0 3387 < 10− 4
< 10th centile 341 (9.68) 413 (11.73) 341 72 0 3109 < 10−4
>90th centile 334 (9.48) 274 (7.78) 274 0 60 3188 < 10−4
>97th centile 113 (3.21) 94 (2.67) 94 0 19 1409 < 10−4
Abdominal circumference (AC)
(n = 3522)
<3rd centile 34 (0.97) 40 (1.14) 34 6 0 3482 0.01
< 10th centile 130 (3.69) 152 (4.32) 130 22 0 3370 < 10−4
>90th centile 731 (20.7) 595 (16.8) 595 0 136 2791 < 10−4
>97th centile 248 (7.04) 191 (5.42) 191 0 57 3274 < 10−4
Femur length (FL)
(n = 3522)
<3rd centile 32 (0.91) 34 (0.99) 32 3 0 3487 0.08
< 10th centile 91 (2.58) 117 (3.32) 91 26 0 3405 < 10−4
>90th centile 736 (20.90) 621 (17.63) 621 0 115 2786 < 10−4
>97th centile 285 (8.09) 236 (6.70) 236 0 49 3237 < 10−4
Estimated foetal weight (EFW)
(n = 3522)
<3rd centile 55 (1.56) 64 (1.82) 55 9 0 3458 0.002
< 10th centile 122 (3.46) 161 (4.57) 122 39 0 3361 < 10−4
>90th centile 629 (17.86) 472 (13.40) 472 0 157 2893 <10−4
>97th centile 191 (5.42) 124 (3.52) 124 0 67 3331 <10−4
  1. GA Gestational age, SD Standard deviation, EFW Estimated foetal weight.
  2. a b = condition fulfilled using Intergrowth-based GA assessment but not Robinson-based GA assessment, and c = condition fulfilled using Robinson-based GA assessment but not Intergrowth-based GA assessment