Untreated hypothyroidism has been common in iodine-replete areas. Frequent thyroid function testing and use of levothyroxine treatment for subclinical hypothyroidism suggest that the prevalence may have decreased. We therefore examined changes in the prevalence of hypothyroidism in a Norwegian county from 1995-97 to 2006-08.
Conversely, the prevalence of treated hypothyroidism among women increased by 60% from 5.0% to 8.0%, and in men, the corresponding prevalence doubled from 1.0% to 2.0%. The prevalence of any form of hypothyroidism remained essentially similar at 9% in women and 3% in men.
Changes in the prevalence of hypothyroidism. The HUNT Study in Norway
BO Asvold, LJ Vatten, T Bjøro
Design
Population surveys of 33 917 individuals in 1995-97 and 49 180 individuals in 2006-08.Methods
We compared the prevalence of untreated overt, untreated subclinical, and treated hypothyroidism between 1995-97 and 2006-08.HUNT staat voor Nord-Trøndelag Health Study
Results
The prevalence of untreated overt hypothyroidism among women decreased by 84% from 1995-97 (0.75%) to 2006-08 (0.12%). The corresponding decrease among men was 43% from 0.21% to 0.12%. For untreated subclinical hypothyroidism, the prevalence among women decreased by 64% from 3.0% to 1.1%, and in men, the prevalence decreased by 54% from 2.1% to 1.0%.Conversely, the prevalence of treated hypothyroidism among women increased by 60% from 5.0% to 8.0%, and in men, the corresponding prevalence doubled from 1.0% to 2.0%. The prevalence of any form of hypothyroidism remained essentially similar at 9% in women and 3% in men.
Conclusions
The prevalence of untreated hypothyroidism in this Norwegian county strongly decreased from 1995-97 to 2006-08. The findings suggest that populations with easy access to thyroid function testing and levothyroxine treatment may now have a low prevalence of untreated hypothyroidism.Lees ook over de Nord-Trøndelag Health Study op Schildkliertje
- Alun Stevens, Newsletter of Thyroid Australia, Volume 3 No 1 January 2002, p. 4-5
- T. Bjøro et al., Prevalence of thyroid disease, thyroid dysfunction and thyroid peroxidase antibodies in a large, unselected population. The Health Study of Nord-Trøndelag (HUNT)
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| © Alexander Witschge |
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