Using the WHO criteria for thyroid stage in population surveys it is possible to determine if endemic goiter is present in the community.
Endemic goiter is considered to exist in a community if
(1) more than 5% of adolescents or pre-adolescents have grade I goiter (or presumably II-IV)
(2) more than 30% of adolescents or pre-adolescents are assigned to grade 0b or above
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Specialty: Endocrinology, Clinical Laboratory