I have got no further with the issue. There doesn't appear to be any historical data from Myanmar either. What is needed, as a minimum starting point, is a small survey measuring both sitting and standing height. This could be done as part of a nutritional anthropometry survey. One children > 85cm would need to have their sitting height measured. Even an opportunistic sample (e.g. from a clinic or CMAM program) would be better than nothing. The two stage screen for CMAM should be handled with care since if MUAC is a referral criteria and W/H is an admission criteria you may get the "problem of rejected referrals" which is a known coverage killer. See: http://www.who.int/nutrition/topics/backgroundpapers_A_%20review.pdf and: http://www.ncbi.nlm.nih.gov/pubmed/20002705 This might be a problem for you particularly as you are using a high (and sensitive) MUAC threshold for referral. It you do both MUAC and W/H in the field then you should be OK. One of the main reasons for using MUAC is that it avoids the problem of rejected referrals. Depending on context MUAC and W/H may select very different sets of children or may select the same set of children. Body-shape plays a role here: http://informahealthcare.com/doi/abs/10.1080/03014460802471205 As may the general public health environment. If body shape is biassing W/H downwards in Myanmar then using MUAC would be advisable.
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