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Data are for the most recent year available, within the specified range.
Where subnational surveys were available, extrapolations were made to the proportion of the total country likely to be affected considering similar ecological conditions. The multiplication factor was applied for countries where the World Health Organization's criteria to identify a public health problem of VAD clinically or subclinically were met. The total population of children 0-4 years of age according to the United Nation's projection for 1995 multiplied by the factor determined the total. Rank is of average standard nutrition ranks.