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Last paragraph very useful!
>
> Well before my doctoral dissertation studies percent weight change was used in
> developing areas of the world to determine which families were eligible for
> nutritional supplements for their infants and young children and/or eligible for
> nutritional counseling. Percent weight loss was abandoned because it does not
> nearly as reliable as tracking growth along a percentile (or z-score curve). The
> reason why this is so is because as infants and young children get older, their
> original weight increases so that a particular percent of weight loss may not
> coincide with the percentiles of normal growth. I remember calculating
> sensitivity and specificity and positive and negative predictive values comparing
> cutoffs using percent weight loss and percentile curves and they do not match.
> This was back in the late 1980s.
>
> So, for older babies, percent of weight change is NOT an indicator that should
> be used. The WHO growth charts SHOULD be used and there are criteria on
> their website for how to interpret drops in percentILES.
>
> The only use I know for knowing percent weight loss is that first check in the first
> week of life that can never really be used without ALSO considering other
> indicators as well. The simplest way to calculate percent weight loss in
> backward countries like the United States that use pounds and ounces (which
> causes enough math errors to hit in my top 10 list of reasons why
> supplementation is unnecessarily used and cases of failure to thrive are missed)
> is to simply switch the scale from pounds and ounces to grams. All good scales
> have that switch. Most babies are weighed in grams at birth. Simply subtract
> the current weight in grams from the birth weight in grams. Move the decimal
> point one digit to the left for the birth weight. You can quickly see if the weight
> loss is greater than 10% in grams.
>
> Susan E Burger, MHS, PhD, IBCLC, RLC
>
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