For a better understanding of z-score calculations for undernutrition.
In the context of malnourished pediatric patients, anthropometric measurements like weight-for-age, height-for-age, and weight-for-height are frequently employed. The WHO growth standards offer mean (M) and standard deviation (SD) values for weight, height, or weight-for-height in each age and sex group. The Z-score is calculated using the formula: Z = (X−M)/SD, where X represents the mean for the child's specific age and sex group. Z scores between -2 and +2 are considered normal.
Child's height or weight minus median height or weight for age and sex, divided by the relevant standard deviation.
A pre-calculated WHO z-score sheet can help you get the child's height for age (stunting-chronic malnitrition), or weight for height (wasting-acute malnutrition) and place them accordingly based on where they fall on the z- score. Minus 2 or 3 correspond to moderate to severe malnutrition.
For a clear understanding please see the attached file below which is a sample.
A handy on line calculator for pediatric Z score here: https://www.bcm.edu/bodycomplab/BMIapp/BMI-calculator-kids.html
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