Physical Development at School Entry in Children with Congenital Hypothyroidism Diagnosed by the National Program of Newborn Screening in Iran.

Background: The newborn screening program for diagnosing and treating children with congenital hypothyroidism (CH) in Iran was established in 2004.

Objectives: This study aimed to evaluate the national program's success in maintaining the physical development and anthropometric indexes of children with CH.

Methods: This historical cohort study was carried out in five provinces located in five different geographical regions of Iran.