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Congenital hypothyroidism in Denmark

B B Jacobsen, N J Brandt

    Archives of Disease in Childhood
    |February 1, 1981
    PubMed
    Summary

    Primary hypothyroidism affects 1 in 6064 infants in Denmark. Diagnosis often occurs within the first year, with thyroid abnormalities like aplasia or hypoplasia being common. This incidence is lower than neonatal screening suggests.

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    Area of Science:

    • Pediatrics
    • Endocrinology
    • Epidemiology

    Background:

    • Primary hypothyroidism is a significant congenital condition affecting infants.
    • Early detection and diagnosis are crucial for managing infant health.
    • Understanding incidence rates and etiological factors is vital for public health strategies.

    Purpose of the Study:

    • To determine the incidence of primary hypothyroidism in a Danish birth cohort.
    • To analyze the age at diagnosis and etiological factors associated with the condition.
    • To compare the study's findings with existing neonatal screening program data.

    Main Methods:

    • Retrospective cohort study of live births in Denmark between 1970-1975.
    • Inclusion of infants diagnosed with primary hypothyroidism.
    • Analysis of diagnostic age, thyroid scintigram findings, and incidence rates.

    Main Results:

    • An incidence of 1 in 6064 live births was observed for primary hypothyroidism.
    • Diagnosis occurred between 1 week and 5 years 4 months, with 70% diagnosed within the first year.
    • Thyroid scintigrams revealed aplastic/hypoplastic glands (72%), ectopic glands (12%), or goiters (16%).

    Conclusions:

    • The study establishes a baseline incidence for primary hypothyroidism in the specified Danish cohort.
    • Thyroid gland morphology influences the age of diagnosis.
    • The observed incidence is lower than anticipated by the Danish neonatal screening program, suggesting potential underdiagnosis or differing methodologies.

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