Z-score, Z-value

A way of expressing a physiologic variable in a form corrected for age and body size. Important in pediatrics. This is the number of standard deviations a measurement departs from mean normal . ( Rimoldi HJA, et al. A note on the concept of normality and abnormality in quantitation of pathologic findings in congenital heart disease. Pediatr Clin North Am 1963;10:589-591. ) (Daubeney PEF et al. Relationship of the dimension of cardiac structures to body size: an echocardiographic study in normal infants and children. Cardiol Young 1999;9:402-410.)