Such facilities presented a rate of anemia similar to the region and had a similar territorial relation, that is, if the area was from the countryside and had a 45% prevalence of children's anemia, institutions in the same place that had a similar proportion of anemia and that historically sent information to CENAN were searched.
Dichos sitios presentaron un proporción de anemia similar a la región y guardaban relación territorial similar, es decir, si la región era de la selva y presentó una prevalencia de anemia en niños de 45%, se buscaban establecimientos de la misma localidad y que tuvieran una proporción similar de anemia y que históricamente enviaran información al CENAN.