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HTDS Guide > Findings and
Interpretations > How the Prevalence of Thyroid Disease in the HTDS
Compares to Other Populations
HTDS Guide
| Findings and Interpretations |
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How the Prevalence of Thyroid Disease in the HTDS Compares to
Other Populations
People often ask how the occurrence of thyroid disease in the HTDS
compares to other populations not exposed to iodine-131 from Hanford.
Based on a descriptive analysis of the most comparable information from
other studies, the HTDS research team found that the rates of thyroid
disease in the study population are generally consistent with the
published literature on other populations. In other words, there is no
indication that the levels of disease in the HTDS population are any
higher than what have been reported around the world in a variety of
different circumstances.
There are a number of reasons why a more definitive comparison
between the HTDS population and other populations groups is not
possible:
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There are no national estimates of thyroid diseases
to which the HTDS can be compared. Moreover, populations with
different characteristics and different exposures may exhibit very
different disease rates. |
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Identification of thyroid disease in a population
depends to a large extent on how aggressively one looks for the
disease. For example, scientists are much more likely to detect
thyroid nodules using ultrasound (such as the HTDS) than they would
conducting a routine thyroid examination. |
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Physicians use different definitions of various
thyroid and other conditions, making it difficult to compare
prevalence of diseases in different populations. Such is the case
with both hyperparathyroidism and hypothyroidism. |
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The methods used for detecting thyroid disease and
other conditions have changed, making it difficult to compare
studies conducted during different time periods. For example,
estimates of the prevalence of autoimmune thyroiditis and thyroid
nodules vary widely depending on the method of detection. |
Nevertheless, the best estimates of the prevalence of thyroid
diseases, including thyroid cancer, in the general population are
consistent with that found in the HTDS population group.
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Findings Compare
to Other Radiation Studies >>
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