High frequency of and factors associated with thyroid hormone over-replacement and under-replacement in men and women aged 65 and over.

The Journal of Clinical Endocrinology and Metabolism
Lily L SomwaruAnne R Cappola

Abstract

Thyroid hormone use is common in older populations, but the frequency of over- or under-replacement is debated. We sought to describe the frequency of and factors associated with thyroid hormone over- or under-replacement in a population of older men and women. Participants were 3678 U.S. community dwelling individuals aged 65 yr or older enrolled in the Cardiovascular Health Study who had thyroid function tests in 1989-1990. Thyroid hormone users (n = 339) were identified and classified into low TSH (<0.45 mU/liter), euthyroid (0.45-4.5 mU/liter), and high TSH (>4.5 mU/liter). Of the 339 thyroid hormone users, 41% had a low TSH, 16% had a high TSH, and 43% were in the euthyroid range. In multivariable analyses, lower weight (P < 0.001) was independently associated with low TSH status. For every 10 kg lower weight, the likelihood of having low TSH increased by 65% [odd ratio (OR) 1.65; 95% confidence interval (CI) 1.31-2.07]. Those with renal insufficiency were less likely to have low TSH levels (P = 0.02). The presence of diabetes was independently associated with having low (OR 3.35; 95% CI 1.46-7.65) and high TSH levels (OR 2.66; 95% CI 1.14-6.21). There is a very high prevalence of thyroid function testing abnormalities in ...Continue Reading

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