Nutrition status
Nutrition status was the main outcome variable of interest
in this review. It was measured as undernutrition or
overweight status. For undernutrition we extracted the
data on countries’ prevalence of stunting, wasting, and
underweight. Stunting was measured as the percentage
of children whose height for age was below minus 2
standard deviations of the WHO child growth standards
median [25,28]. Underweight was measured as the percentage
of those children whose weight for age was below
minus 2 standard deviations of the WHO child growth
standards median [25,28]. Wasting was defined and the
percentage of children whose weight for height was below
minus 2 standard deviations of the WHO growth standards
median. Overweight was defined as the percentage
of children whose weight for age was above plus 2 standard
deviations of the WHO child growth standards median
[25,28].