About The Z-Score CalculatorsThis collection of z-score calculators represents my effort to discover, organize, and adapt published medical literature and data for use in the setting of a pediatric echo lab. I have tried to present the calculations without passion or prejudice; I do not defend or endorse any of the calculations. I leave it to you to read the source literature, double check the work, and determine the suitability of the calculations.
The resources are hosted by Google Code. You are welcome to examine, use, and adapt them.
About Z-Scores (in general)According to the American Society of Echo's Guidelines and Standards for Performance of a Pediatric Echocardiogram:
In addition to reporting the absolute values, it is useful to report quantitative measures within the context of age- or size-appropriate norms (eg, z-score values).
A z-score indicates:
how many standard deviations an observation is above or below the mean. It allows comparison of observations from different normal distributions, which is done frequently in research.(See the Wikipedia entry for more information about z-scores.)Concerning the application of z-scores to pediatric cardiology, interested persons should read:
- the invited editorial Establishing norms for echocardiographic measurements of cardiovascular structures and function in children
- the original article Theoretical and empirical derivation of cardiovascular allometric relationships in children
- the excellent chapter in Nadas' Pediatric Cardiology: Methodological Issues in Clinical Research
- the recent work, A Novel Method of Expressing Left Ventricular Mass Relative to Body Size in Children
- other recent works:
About MeMy name is Dan Dyar. Among many other things, I am a Pediatric Cardiac Sonographer. Having worked in this field since Before The Internet, I sometimes observe the collision of technology and information in this field and am astonished by the disparity: we are simultaneously incredibly advanced and desperately primitive.
I hope this website helps soften these collision.
Should you wish to contact me, fill out the form here and hope for the best.
The calculators provided are not meant to be a substitute for professional advice and are not to be used for medical diagnosis. All calculations must be confirmed before clinical use or diagnostic purposes by qualified medical professionals. The author makes no claims of the accuracy of the information contained herein. The authors make no claims whatsoever, expressed or implied, about the authenticity, accuracy, reliability, completeness or timeliness of the material, software, text, graphics and links given. In no event shall the author, suppliers, affiliates or any third parties be liable in any manner whatsoever for any damage arising upon use of any information provided.