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Table 2: Equations of the regression curves with their respective levels of significance and the R² for the TCD, CHL, CSA, TDPF, PF area, VW, and ratio TCD/TDPF
Parameter Regression Curve P Value^{^a} R²
TCD y = 64.38–30.58*x + 4.606*x² <.0001 0.907
CHL y = −78.26 + 31.6*x–2.849*x² <.0001 0.117
CSA y = 21.61 + 12.44*x <.0001 0.265
TDPF y = −65.28 + 19.95*x <.0001 0.894
PF area y = 14.25–8.537 *x +1.369*x² <.0001 0.875
VW y = 51.5–17.59*x + 1.692*x² .0257 0.027
Ratio TCD/TDPF y = 3.87–1.215*x + 0.1192*x² <.0001 0.243
Note:—x indicates square root (gestational age in weeks); R², coefficient of determination.
↵a P value according to Fisher F test.

Parameter	Regression Curve	P Value^{^a}	R²
TCD	y = 64.38–30.58x + 4.606x²	<.0001	0.907
CHL	y = −78.26 + 31.6x–2.849x²	<.0001	0.117
CSA	y = 21.61 + 12.44*x	<.0001	0.265
TDPF	y = −65.28 + 19.95*x	<.0001	0.894
PF area	y = 14.25–8.537 x +1.369x²	<.0001	0.875
VW	y = 51.5–17.59x + 1.692x²	.0257	0.027
Ratio TCD/TDPF	y = 3.87–1.215x + 0.1192x²	<.0001	0.243