Regression equations for calculation of z scores of cardiac structures in a large cohort of healthy infants, children, and adolescents: an echocardiographic study.

By M. Pettersen, W. Du, M. Skeens, R. Humes. Journal of the American Society of Echocardiography, 2008

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Recommendations for quantification methods during the performance of a pediatric echocardiogram: a report from the Pediatric Measurements Writing Group of the American Society of Echocardiography Pediatric and Congenital Heart Disease Council. (2010, methodology): “Another example involves performing a logarithmic transformation of the measurements to minimize the problem of heteroscedasticity.(17) However, this method does not effectively describe the population at minimum and maximum BSA values, nor does it fully eliminate heteroscedasticity.”