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Table 5 Agreement and reliability of fetal biometrics z scores using Intergrowth 21st and Salomon equations in the third trimester

From: Fetal biometry assessment with Intergrowth 21st’s and Salomon’s equations in rural Burkina Faso

Anthropometrics Mean ± SD p-value* Median (IQR) p-value Range
Biparietal diameter
 Intergrowth 21 −0.91 ± 0.70   −0.89 (−1.31; −0.44)   −2.62; 0.78
 Salomon − 0.53 ± 0.64   −0.49 (− 0.90; − 0.11)   −2.10; 1.00
 Difference −0.39 ± 0.07 <  0.001 −0.38 (− 0.44; − 0.34) <  0.001 −0.53; − 0.22
 LOA −0.52; − 0.25     
 ICC 0.85     
Abdominal circumference
 Intergrowth 21 0.81 ± 0.71   0.75 (0.29; 1.21)   −0.95; 2.89
 Salomon 0.35 ± 0.43   0.36 (0.02; 0.63)   −0.68; 1.45
 Difference 0.45 ± 0.31 <  0.001 0.37 (0.25; 0.64) <  0.001 −0.27; 1.48
 LOA −0.16; 1.07     
 ICC 0.66     
Head circumference
 Intergrowth 21 0.76 ± 0.70   0.70 (0.39; 1.21)   −0.87; 2.49
 Salomon 0.85 ± 0.48   0.79 (0.58; 1.17)   −0.28; 2.05
 Difference −0.09 ± 0.22 <  0.001 − 0.09 (− 0.18; 0.07) 0.001 −0.59; 0.44
 LOA −0.52; 0.35     
 ICC 0.92     
Femur length
 Intergrowth 21 1.09 ± 1.15   1.15 (0.53; 1.75)   −2.44; 3.55
 Salomon 0.07 ± 0.90   0.13 (−0.38; 0.55)   − 2.54; 2.02
 Difference 1.02 ± 0.26 <  0.001 1.04 (0.91; 1.16) <  0.001 0.10; 1.53
 LOA 0.50; 1.53     
 ICC 0.65     
  1. * Paired t test p value
  2. † Wilcoxon signed ranks test p value
  3. LOA limits of agreement, ICC intraclass correlation coefficient