In general, if age specific or age-standardized information is used, scale of measurement does not affect prevalence of low anthropometry. Age distribution will affect prevalence with different indices since coefficient of variation changes through childhood, especially in the first two years. Table summary of characteristics of scales. Decrease in prevalence of low anthropometry. Make sure age distribution is similar.
Some studies show threshold risk effect.
Cut-offs indicate which kids are more likely to be malnourished.