Assessment of left ventricular systolic function using two- and three-dimensional speckle tracking echocardiography among healthy preschool-age pediatric children.

P less than or equal to 0.05 was accepted as statistically significant with confidence interval (CI) greater than 95%, and P less than or equal to 0.001 was considered highly significant; the relations between age and 2D and 3D global strain (GS) parameters were determined using scatterplots, one-way analysis of variance, and second-order polynomial regression analysis and linear regression analysis.

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