Here is an official guideline from the United Nations Standing Committee on Nutrition (SCN) on the assessment of the nutritional status of adults in emergency-affected populations. This guidelines reviews the use of BMI, MUAC, clinical, and mixed indicator methods.
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Updated link
I found a link that works for this document.
Link updated
Thanks for that. I have also found a new link and have updated the main story (above). I think we should keep both just in case there is another change.