There have been quite a few discussions WRT discrepancies between prevalence by MUAC and WHZ in these pages. Here are a few links: [url]http://www.en-net.org.uk/question/770.aspx[/url] [url]http://www.en-net.org.uk/question/759.aspx[/url] [url]http://www.en-net.org.uk/question/747.aspx[/url] [url]http://www.en-net.org.uk/question/744.aspx[/url] [url]http://www.en-net.org.uk/question/708.aspx[/url] [url]http://www.en-net.org.uk/question/649.aspx[/url] [url]http://www.en-net.org.uk/question/543.aspx[/url] [url]http://www.en-net.org.uk/question/328.aspx[/url] [url]http://www.en-net.org.uk/question/200.aspx[/url] [url]http://www.en-net.org.uk/question/83.aspx[/url] [url]http://www.en-net.org.uk/question/82.aspx[/url] There are more! A few reasons come to mind for your specific observation ... Age distribution of cases : MUAC cases will tend to be younger than WHZ cases. This can be quite extreme in warm-climate pastoralist populations where WHZ may select healthy older children with long limbs. WHZ and MUAC select different populations and the relationship between the indicator and sex may be different in different populations. Sex : Females tend to have slightly lower MUACs than males so any fixed cut-point is likely to select slightly more females than males even if males and females were equally at risk of wasting. If there is unequal risk it may favour boys (e.g. they may get the better food and receive preferential treatment when sick) leading to proportionally more girls being wasted. Body shape : Males may have a more extreme body shape (i.e lower sitting to standing heigh ratio) than girls. This could be genetic or environmental (e.g. boys get more milk, better treatment seeking when sick, better food). WHZ is strongly influenced by body shape (i.e. boys may have lower WHZ than girls). Error : It might be error or chance (unlikely given that it has happened in multiple surveys. It might be a combination of these things. I hope this helps.

Dear Mark, Thank you very much for the detailed explanation and sharing the link on similar discussions. Regards, Lubaba