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10/1/20
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Using Z-Scores to Track AnthropometricMeasurements in Pediatrics
Jodi Wolff, MS, RDN, LD, FAND, FAACPDMPediatric Dietitian, Rainbow Babies and Children’s Hospital
Adjunct Professor, Case Western Reserve School of MedicineCleveland, OH, USA
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• Z-score: A number that indicates how far a data point is from the mean (average)
Curtis AE, et al. Aorta (Stamford). 2016;4(4):124-130.
What Is a Z-score?
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Why Use Z-scores vs Percentiles?
• Comparable across age and sex • Quantify growth outside of percentile ranges• More descriptive than “<2nd percentile or between the
25th and 50th percentiles”• Reflects small changes sooner than percentile• Better defines severity of malnutrition
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10/1/20
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-2.35
-5.14
<
<<
“Less Than the 2nd Percentile”
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-2 (2.3%)
-1 (15.9%)
0 (50%)
-3 (0.13%)
1 (84.1%)
2 (97.7%)
3 (99.8%)
Weight-for-Length Percentiles
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Degree of Malnutrition Z-scoreMild -1 to -1.99
Moderate -2 to -2.99Severe -3 or less
Becker PJ, et al. J Acad Nutr D iet. 2014;114(12):1988-2000.
Z-scores and Malnutrition
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