title: An analysis of the variation of incidence of congenital dysgenetic hypothyroidism in various countries.
abstract: The seasonal and chronological distributions of birth dates of 820 patients with congenital hypothyroidism due to thyroid dysgenesis were analysed in eight areas in the world. The incidence had some seasonal variations in certain areas. These observations suggest that some environmental factors cause this disease.
mesh_terms: D001315:Australia; D002170:Canada; D003409:Congenital Hypothyroidism; D005602:France; D006801:Humans; D007037:Hypothyroidism / Q000453:epidemiology; D007231:Infant, Newborn; D007564:Japan; D008403:Mass Screening; D009664:Norway; D010414:Pennsylvania; D012621:Seasons; D013557:Switzerland; D013961:Thyroid Gland / Q000002:abnormalities*