Congenital Hypothyroidism and its Related Factors in an Iranian Population: A Retrospective Study in Semnan (2011-2016).

Although the incidence of CH varies from one region to another, it is generally estimated to be 1 per 3,000–4,000 live births worldwide, and recent studies have shown an increasing trend.[ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] In a study conducted by Olivier et al . in Italy in 2015, the incidence of CH had increased from a ratio of 1 to 3,000 to a ratio of 1 to 1,940 live births during the period 1987–1998 (period 1) and the period 1999–2008 (period 2).[ 19

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