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Table 5: Linear association between gestational age and biometric measurements
Linear Regression Coefficient Model Summary
Unstandardized β^{^a} Standardized β Adjusted R²
SI 
    US 2D 0.693 0.916 0.839
    US 3D 0.833 0.899 0.806
    MRI 0.742 0.811 0.656
AP 
    US 2D 0.559 0.871 0.757
    US 3D 0.574 0.800 0.637
    MRI 0.606 0.791 0.624
Perimeter 
    US 2D 2.340 0.912 0.831
    US 3D 2.989 0.889 0.790
    MRI 3.243 0.843 0.708
SA 
    US 2D 18.487 0.948 0.897
    US 3D 19.670 0.897 0.804
    MRI 17.587 0.844 0.711
↵a P < .001 for all coefficients.

	Linear Regression Coefficient		Model Summary
	Unstandardized β^{^a}	Standardized β	Adjusted R²
SI
US 2D	0.693	0.916	0.839
US 3D	0.833	0.899	0.806
MRI	0.742	0.811	0.656
AP
US 2D	0.559	0.871	0.757
US 3D	0.574	0.800	0.637
MRI	0.606	0.791	0.624
Perimeter
US 2D	2.340	0.912	0.831
US 3D	2.989	0.889	0.790
MRI	3.243	0.843	0.708
SA
US 2D	18.487	0.948	0.897
US 3D	19.670	0.897	0.804
MRI	17.587	0.844	0.711