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Risk factors for congenital hypothyroidism: results of a population case-control study (1997-2003)

Emanuela Medda1, Antonella Olivieri, Maria Antonietta Stazi

  • 1Centro Nazionale di Epidemiologia, Sorveglianza e Promozione della Salute, Istituto Superiore di Sanità, Rome, Italy.

European Journal of Endocrinology
|December 3, 2005
PubMed

Insights

Identifying risk factors for congenital hypothyroidism (CH) is crucial. This study found twins, birth defects, and later gestational age increase permanent CH risk, while intrauterine growth retardation and preterm birth indicate transient CH.

Area of Science:

  • Endocrinology
  • Pediatrics
  • Genetics

Background:

  • Congenital hypothyroidism (CH) is a common endocrine disorder in newborns.
  • Understanding risk factors is essential for early detection and management.
  • Previous studies have identified several potential risk factors, but a comprehensive analysis distinguishing between permanent and transient forms is needed.

Purpose of the Study:

  • To identify and analyze risk factors associated with permanent and transient congenital hypothyroidism (CH).
  • To investigate familial, maternal, neonatal, and environmental influences on CH development.

Main Methods:

  • A population-based case-control study utilizing the Italian National Register of Infants with CH.
  • 173 CH cases and 690 controls were enrolled over 4 years.
  • Diagnosis re-evaluation at 3 years distinguished between permanent and transient CH, analyzing various influencing factors.

Main Results:

  • Twins showed a significantly increased risk for permanent CH (OR = 12.2).
  • Additional birth defects, female gender, and gestational age >40 weeks were associated with permanent CH.
  • Intrauterine growth retardation and preterm delivery were independent risk factors for transient CH.

Conclusions:

  • Congenital hypothyroidism (CH) has a multifactorial etiology.
  • Both genetic and environmental factors contribute to the development of CH.
  • Specific risk factors identified aid in differentiating between permanent and transient forms of CH.
Abstract

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