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Table 3 Agreement and reliability of fetal biometrics z scores using Intergrowth 21st and Salomon equations in the second 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

− 0.48 ± 0.72

 

− 0.47 (− 0.98; − 0.04)

 

−3.40; 3.11

 Salomon

− 0.15 ± 0.63

 

− 0.12 (− 0.60; 0.24)

 

−2.68; 2.81

 Difference

− 0.33 ± 0.21

<  0.001

− 0.40 (− 0.48; − 0.22)

<  0.001

− 0.72; 0.33

 LOA

− 0.74; 0.07

    

 ICC

0.85

    

Abdominal circumference

 Intergrowth 21

1.05 ± 1.18

 

0.95 (0.35; 1.59)

 

−2.07; 9.90

 Salomon

0.29 ± 0.63

 

0.23 (−0.03; 0.58)

 

−1.37; 5.22

 Difference

0.77 ± 0.60

<  0.001

0.69 (0.40; 1.01)

<  0.001

− 0.70; 4.68

 LOA

− 0.40; 1.94

    

 ICC

0.54

    

Head circumference

 Intergrowth 21

0.75 ± 0.81

 

0.72 (0.14; 1.29)

 

−1.56; 4.24

 Salomon

0.72 ± 0.61

 

0.67 (0.31; 1.14)

 

−0.94; 3.36

 Difference

0.03 ± 0.33

0.18

−0.02 (− 0.22; 0.23)

0.85

−0.62; 1.01

 LOA

−0.62; 0.68

    

 ICC

0.89

    

Femur length

 Intergrowth 21

1.21 ± 0.92

 

1.34 (0.63; 1.81)

 

−1.53; 4.00

 Salomon

0.36 ± 0.71

 

0.47 (−0.07; 0.77)

 

−1.85; 2.57

 Difference

0.85 ± 0.21

<  0.001

0.88 (0.73; 0.97)

<  0.001

0.21; 1.43

 LOA

0.43; 1.27

    

 ICC

0.63

    
  1. * Paired t test p value
  2. † Wilcoxon signed ranks test p value
  3. Intraclass correlation calculation for abdominal circumference z scores excluded one participant with extreme values (9.9 using Intergrowth equations and 5.22 using Salomon equations)
  4. LOA limits of agreement, ICC intraclass correlation coefficient