Linear Regression Analysis A linear regression analysis was performed on all cases and for the two subgroups, intact membranes and ruptured membranes, as follows ( Figure 4 and Figure 5 ): Overall (all cases) R-squared: 0.856 (very strong), p -value: <0.001 (highly significant); Regression equation: Ultrasound Mean Diameter ≈ 13.94 + 0.67 × Clinical Dilatation.
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Membrane Status and Reliability of Intrapartum Transperineal Ultrasound in Cervical Dilatation Assessment.
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