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Endocrine Care |
Centers for Disease Control, National Center for Environmental Health, Division of Emergency and Environmental Services (J.G.H.), Division of Environmental Hazards and Health Effects (N.W.S.), Division of Environmental Laboratory Sciences (W.H.H., E.W.G.), Atlanta, Georgia 30341; Emory University School of Public Health (W.D.F.), Atlanta, Georgia 30324; University of Southern California Medical Center (C.A.S.), Los Angeles, California 90032; and Boston Medical Center (L.E.B.), Boston, Massachusetts 02116
Address all correspondence and requests for reprints to: Joseph G. Hollowell, M.D., MPH 435 North 1500 Road Lawrence, Kansas 66049. E-mail: jgh3{at}mindspring.com
Abstract
NHANES III measured serum TSH, total serum T4, antithyroperoxidase (TPOAb), and antithyroglobulin (TgAb) antibodies from a sample of 17,353 people aged 
12 yr representing the geographic and ethnic distribution of the U.S. population. These data provide a reference for other studies of these analytes in the U.S.
For the 16,533 people who did not report thyroid disease, goiter, or taking thyroid medications (disease-free population), we determined mean concentrations of TSH, T4, TgAb, and TPOAb. A reference population of 13,344 people was selected from the disease-free population by excluding, in addition, those who were pregnant, taking androgens or estrogens, who had thyroid antibodies, or biochemical hypothyroidism or hyperthyroidism. The influence of demographics on TSH, T4, and antibodies was examined.
Hypothyroidism was found in 4.6% of the U.S. population (0.3% clinical and 4.3% subclinical) and hyperthyroidism in 1.3% (0.5% clinical and 0.7% subclinical). (Subclinical hypothyroidism is used in this paper to mean mild hypothyroidism, the term now preferred by the American Thyroid Association for the laboratory findings described.) For the disease-free population, mean serum TSH was 1.50 (95% confidence interval, 1.46–1.54) mIU/liter, was higher in females than males, and higher in white non-Hispanics (whites) [1.57 (1.52–1.62) mIU/liter] than black non-Hispanics (blacks) [1.18 (1.14–1.21) mIU/liter] (P < 0.001) or Mexican Americans [1.43 (1.40–1.46) mIU/liter] (P < 0.001). TgAb were positive in 10.4 ± 0.5% and TPOAb, in 11.3 ± 0.4%; positive antibodies were more prevalent in women than men, increased with age, and TPOAb were less prevalent in blacks (4.5 ± 0.3%) than in whites (12.3 ± 0.5%) (P < 0.001). TPOAb were significantly associated with hypo or hyperthyroidism, but TgAb were not. Using the reference population, geometric mean TSH was 1.40 ± 0.02 mIU/liter and increased with age, and was significantly lower in blacks (1.18 ± 0.02 mIU/liter) than whites (1.45 ± 0.02 mIU/liter) (P < 0.001) and Mexican Americans (1.37 ± 0.02 mIU/liter) (P < 0.001). Arithmetic mean total T4 was 112.3 ± 0.7 nmol/liter in the disease-free population and was consistently higher among Mexican Americans in all populations. In the reference population, mean total T4 in Mexican Americans was (116.3 ± 0.7 nmol/liter), significantly higher than whites (110.0 ± 0.8 nmol/liter) or blacks (109.4 ± 0.8 nmol/liter) (P < 0.0001). The difference persisted in all age groups.
In summary, TSH and the prevalence of antithyroid antibodies are greater in females, increase with age, and are greater in whites and Mexican Americans than in blacks. TgAb alone in the absence of TPOAb is not significantly associated with thyroid disease. The lower prevalence of thyroid antibodies and lower TSH concentrations in blacks need more research to relate these findings to clinical status. A large proportion of the U.S. population unknowingly have laboratory evidence of thyroid disease, which supports the usefulness of screening for early detection.
IN THE TWENTIETH century, thyroid studies focused on goiter and iodine deficiency. Following the introduction of iodized salt and iodine in other foods, iodine deficiency was eliminated in the U.S. (1, 2, 3, 4), and thyroid disease was related to other conditions, many of which are worsened by excessive iodine intake (5). NHANES III (1988–1994), and NHANES I (1971–1974) found that the median urinary iodine (UI) concentration decreased from 320 µg/liter to 145 µg/liter over the 20 yr (6). As part of a study of iodine nutrition in the U.S. from 1988–994, NHANES III also measured serum TSH, total serum T4, and thyroid antibodies (TgAb, and TPOAb) in the U.S. Thyroid function tests in the U.S. previously have been limited to clinical settings or regions.
With the awareness that subclinical and clinical forms of hyperthyroidism and hypothyroidism in the U.S. are emerging as potential contributors to morbidity from osteoporosis, hyperlipidemia, hypercholesterolemia, hyperhomocysteinemia, and cardiovascular and neuropsychiatric disease, especially in the older population (7, 8, 9, 10, 11), we undertook the present study to provide reference data for TSH, T4, TgAb, and TPOAb in the U.S. and evaluate the status of thyroid function from data using the population sampling methodology of NHANES III.
Patients and Methods
Sample design
The NHANES surveys were designed to give national normative estimates of the health and nutritional status of the U.S. civilian, noninstitutionalized population. NHANES III was conducted from 1988 through 1994 using a stratified, multistage probability design. Young children, older people, blacks, and Mexican Americans were oversampled to provide sufficient numbers for studies of those groups (12, 13). This study focuses on the 17,353 people aged 12 yr who had thyroid studies, representing the weighted population of 205,562,185 people. (In NHANES III, each person sampled is mathematically weighted to represent a specific number and proportion of people in the population and during analysis that weighting is used to adjust for any oversampling.) Thyroid hormone tests were done on a sample of people 12 yr of age or older. Serum was frozen (-20 C) and shipped on dry ice to the University of Southern California, Endocrine Services Laboratory (Los Angeles, CA) for analysis of thyroid antibodies and TSH (14). Serum T4 was sent for analysis to the White Sands Research Center (Alamogorda, NM). Fasting urine specimens were collected, frozen (-20 C), and shipped on dry ice to the Iodine Research Laboratory, University of Massachusetts Medical Center (Worcester, MA) for UI and to the University of Minnesota Medical School for urinary creatinine (14).
Information was collected on age, sex, income levels, metropolitan/nonmetropolitan residency, and ethnicity. Ethnicity was categorized as white non-Hispanic (whites), black non-Hispanic (blacks), Mexican American, and remaining ethnic groups. A diagnosis of thyroid disease was made from historical information on goiter, thyroid diseases, and use of thyroid medication; however, there was no examination of the neck for goiter or thyroid size.
Laboratory methods
T4. T4 was measured using an immunoassay for T4 (Roche Molecular Biochemicals, Indianapolis, IN), which had a reference (normal) range of 57.9 nmol/liter to 169.9 nmol/liter (4.5 µg/dl to 13.2 µg/dl).
TSH. TSH was measured with a chemiluminescence immunometric assay (Nichols Institute Diagnostics, San Juan Capistrano, CA) (15). The working range for this method is 0.01mIU/liter to 50 mIU/liter. The reference (normal) range for the test was 0.39–4.6 mIU/liter.
TgAb and TPOAb. TPOAb and TgAb were measured by a highly sensitive, direct RIA system (Kronus, San Clemente, CA) (16, 17). The normal range for TgAb in humans is <1.0 IU/ml, and for TPOAb, <0.5 IU/ml.
Iodine. UI concentrations were determined using the Sandell-Koltoff reaction (18, 19).
Creatinine. Urine creatinine was measured by the Jaffè alkaline picrate method, to adjust iodine concentration for creatinine concentration [µg iodine/g creatinine(I/Cr)] (14, 18).
Statistical analyses
We analyzed data with SUDAAN software (Research Triangle Institute, Triangle Park, NC) for the statistical analysis of correlated data (20) to account for the complex sample survey design using the weights assigned to the individuals sampled to represent the U.S. population.* P values and confidence intervals are large sample results calculated by SUDAAN and accounts for the survey design. (The individuals interviewed and examined were given weights to represent the composition of the total United States civilian, noninstitutionalized population. In our analysis, we further adjusted the population on which iodine or the thyroid related analytes were collected to reflect the composition of the U.S. population.)
Regions and race in NHANES III were standardized for age and sex using the distribution of the entire population.
The means and SEM for TSH were calculated from logarithmic transformed values; for T4, arithmetic means with SEM. The median, 2.5 and 97.5 percentiles were calculated to generate possible reference limits for TSH and T4 from the reference population (21, 22).
To study the characteristics of persons with high or low TSH and/or the presence of antibodies, we calculated prevalence, prevalence differences, prevalence ratios, and odds ratios. Logistic regression was used to determine the association of high or low TSH values with other variables including sex, age, ethnic group, poverty level, urban/rural status, region, presence of thyroid antibodies, and UI concentration. Effect modification was assessed by including interaction terms. For these analyses, high TSH was defined as a concentration >4.5 mIU/liter and low TSH as a value <0.1 mIU/liter; high T4 is a concentration 169.9 nmol/liter and low T4, a concentration <57.9 nmol/liter. Hyperthyroidism was defined as clinically significant if TSH <0.1 mIU/liter and T4 169.9 nmol/liter and as subclinical or mild when TSH <0.1 mIU/liter and T4 <169.9 nmol/liter. Hypothyroidism was defined as clinically significant if TSH >4.5 mIU/liter and T4 <57.9 nmol/liter and as subclinical or mild when TSH >4.5 mIU/liter and T4 57.9 nmol/liter. We chose 0.1 mIU/liter for the lower normal value for TSH instead of the laboratory reference range of 0.39 mIU/liter because values between 0.1 mIU/liter and 0.39 mIU/liter are generally considered clinically insignificant using this sensitive TSH assay.
Linear regression analysis was used to assess the association of TSH, after logarithmic transformation, with other characteristics. We screened for potential colinearity by assessing the correlations between independent variables.
Results
We studied the 17,353 people age 12 yr for whom TSH, T4, and thyroid antibodies were available (the total population), 4.6% of whom had hypothyroidism [an estimated 9,597,742 people in the U.S. (0.3% clinical and 4.3% subclinical], and 1.3% had hyperthyroidism [an estimated 2,610,097 people (0.5% clinical and 0.7% subclinical)]. Because free T4 was not available and because estrogen influences total T4 concentrations, we reanalyzed the total population for thyroid disease after excluding individuals who were pregnant or taking estrogen (Table 1
.). There were significantly more females than males with combined subclinical and clinical hypothyroidism in the age groups 50–59 yr and 60–69 yr (P < 0.01). Of the 820 people in the total population who self reported thyroid disease or who were taking thyroid medications, 15.0% had biochemical evidence of hypothyroidism (2.2% clinical, 12.8% subclinical), and 18.3% had hyperthyroidism (7.3% clinical, 10.9% subclinical). This finding supports the usefulness of self reporting of thyroid disease in NHANES III but suggests that only 67% of those with thyroid disease may have been appropriately treated. This survey estimates that 10.4 million people in the U.S. had thyroid disease, goiter, or were taking thyroid medication (estimated from the sample who self-reported). For those not reporting thyroid disease, an estimated additional 8.7 million people, showed biochemical evidence of either hypothyroidism or hyperthyroidism, 9.2% of them with clinically significant thyroid disease (Table 1).
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).
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TSH.
The geometric mean serum TSH for the total population was 1.47 (95% confidence interval 1.44–1.51) mIU/liter. It was higher in the disease-free population [1.50 (1.46–1.54) mIU/liter] but was lower in the reference population [1.40 (1.37–1.44) mIU/liter]. Mean TSH concentration and the percent with TSH >4.5mIU/liter was significantly higher in females than males in the total population (P < 0.01), and the disease-free population (P < 0.05) but not in the reference population (Table 3).
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).
In the reference population, the TSH concentration distribution of blacks was shifted to the left compared with whites and Mexican Americans even within the normal range (Fig. 1). People with risk factors had significantly higher mean TSH concentrations than those in the reference population, i.e. without risk factors. We continued to find the increase in TSH concentration associated with age in men and women without risk factors, but the difference between males and females was smaller when risk factors were absent (Fig. 2). The difference in mean TSH concentrations was also significant between whites with and without risk factors and between Mexican Americans with and without risk factors but was not significant between blacks with or without risk factors (Fig. 4).
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). Elevated serum TSH values were more frequent in females than in males in age groups 40–49 (P < 0.05), 50–59 (P < 0.01), and 60–69 (P < 0.001). The prevalence pattern by age of people with TSH <0.4 mIU/liter was similar in the disease-free and reference population and quite different from people in the total population (Fig. 3B). The higher prevalence of low TSH in the total population was due to the abnormal laboratory values among people who self-reported thyroid disease, goiter, and taking thyroid medication, perhaps reflecting inappropriate treatment of the underlying disease.
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). Estimated from the reference population, the median TSH concentration was 1.39 (1.35–1.47) mIU/liter with the 95% TSH reference limits between 0.45 (0.42–0. 47) mIU/liter and 4.12 (3.94–4.45) mIU/liter. The median TSH concentration increased with age after age 20 yr in all populations, even in the reference population where thyroid antibodies and other risk factors were excluded.
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For the disease-free population, the mean total T4 was 112.3 ± 0.7 nmol/liter (8.7 ± 0.1 µg/dl) After age 20 yr, T4 concentrations decreased significantly with age (P < 0.001). In the reference population, total T4 in Mexican Americans (116.3 ± 0.7 nmol/liter) was significantly higher than whites (110.0 ± 0.8 nmol/liter) or blacks (109.4 ± 0.8 nmol/liter) (P < 0.0001). The difference persisted in all age groups and in the disease-free population as well. There was no significant difference in the T4 concentrations between whites and blacks.
In the reference population, the median T4 concentration was 109.3 (107.3–111.8) nmol/liter [8.5 (8.3–8.7) µg/dl] with the 95% reference limits between 65.2 (64.3–66.8) nmol/liter and 162.8 (155.8–165.8) nmol/liter (5.1 and 12.6 µg/dl) (Table 5).
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In the total population, positive TPOAb (0.5 IU/ml) were detected in 13.0 ± 0.4%, and positive TgAb (1.0 IU/ml) was detected in 11.5 ± 0.5%. The prevalence of positive antibodies was lower in the disease-free population: TPOAb, 11.3 ± 0.4% and TgAb, 10.4 ± 0.5%. The prevalence of positive TPOAb and positive TgAb in the total and disease-free population was higher in females than males (P < 0.001) and increased with age, especially among females. The percentage of whites with positive TPOAb and TgAb was higher than the percentage of blacks (P < 0.001) or Mexican Americans (P < 0.01) (Table 6).
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Interrelationships of analytes
Using linear regression, concentrations of TSH in the total population were associated with positive TPOAb concentrations (P < 0.01) but not with positive TgAb concentrations (P = 0.6), when both were included in the model.
Using logistic regression, the prevalence of TSH values >4.5 mIU/liter was associated with the presence of positive TPOAb (OR = 8.4, 5.8–12.1) (P < 0.0001) and less strongly associated with positive TgAb (OR = 1.8, 1.3–2.7) (P < 0.01). The significant association between female gender and elevated TSH disappeared after controlling for positive TPOAb. The prevalence of clinical hypothyroidism was strongly associated with positive TPOAb (OR = 39.7, 11.6–136.1) (P < 0.0001) but was not associated with positive TgAb (P = 0.3). No individual with hypothyroidism had positive TgAb in the absence of positive TPOAb. The prevalence of TSH <0.4 was associated with positive TPOAb (OR = 3.0, 2.1–4.2) (P < 0.0001) but not TgAb (P = 0.85). The prevalence of clinical hyperthyroidism was associated with positive TPOAb (OR = 5.2, 2.4–11.5) (P < 0.001) but not TgAb (P = 0.6). The same relationship patterns existed in the disease-free population.
Relation of UI concentrations to TSH concentrations
When the geometric mean TSH concentrations were compared with iodine excretion, significantly higher TSH concentrations were found in persons with high I/Cr (>500 µg/g creatinine) than in persons with normal I/Cr excretion (50–500 µg/g creatinine) (P < 0.02), but not in people with low I/Cr. In the logistic regression model I/Cr >1000 µg/g creatinine was significantly associated with TSH concentrations >4.5 mIU/liter (P < 0.001). We found little or no difference in the mean TSH in people excreting normal UI (50–500 µg/liter) and those with either high or low UI. TSH was not a sensitive indicator of iodine deficiency in this population.
Discussion
This national survey demonstrates that average serum TSH concentrations and the prevalence of antithyroid antibodies are greater in women, increase with age, and are higher in whites and Mexican Americans than in blacks. Serum TSH values were also slightly higher in children aged 12–19 yr than in young adults aged 20–29 yr. These findings are in keeping with previous reports for older adults, women, and children (23, 24, 25, 26, 27, 28, 29, 30, 31, 32).
A recent study of 25,862 people attending a state fair in Colorado found that 9.5% had TSH values >5.01 mIU/liter and 2.2% had TSH <0.3 mIU/liter. They found that only 60% of people taking thyroid medication had normal serum TSH values, which is similar to our findings among those who reported thyroid disease, goiter, or taking thyroid medications (33). We cannot explain the differences in the prevalence of thyroid disease between our findings and those seen in Colorado; however, they may relate to sampling methodology and regional differences. The NHANES sampling attempts to represent the U.S. population. For example, when we analyzed the rates of thyroid disease using only the white women studied without adjusting for the study sampling design, we get rates that approximate those found in Colorado.
Tunbridge et al. (34) in the Whickham, UK survey found that serum TSH levels did not vary with age in men but increased markedly in women aged greater than 45 yr. They found no increase in TSH with age in women in the absence of antithyroid antibodies. Our findings are somewhat different from those of Tunbridge et al. When we analyzed the population without antithyroid antibodies, the significant increase of TSH with age in both men and women persisted.
Serum TPOAb and TgAb concentrations increased with age. Antibodies were more prevalent in women than in men and less prevalent in black than in other ethnic groups. Increasing serum thyroid antibody prevalence with age has been found in other studies (31, 34, 35, 36, 37). Although this cross-sectional study does not determine the risk for developing either subclinical hypothyroidism or progression of subclinical hypothyroidism to more clinically significant hypothyroidism, such a progression has been reported in some longitudinal studies (31, 38, 39).
The higher serum TSH concentration in whites than in blacks was previously reported in a small hospital-based population (40) and in an urban population among people over age 55 yr (41). In the present NHANES III study, TSH was higher in whites than in blacks even in the absence of thyroid antibodies and other risk factors. Although antibodies were less frequent in blacks, their association with TSH concentrations was much less in blacks than in whites. Environmental factors may be playing a role in these differences between whites and blacks, but analysis of region, poverty status, urban vs. rural residence failed to detect a significant association other than race. This suggests that the thyroid-pituitary set-point for blacks may be different than for whites, due to as yet undefined factors. Although the group differences are significant, in view of the wide individual variation among persons in the various ethnic groups, it is probably inappropriate at this time to recommend separate clinical reference limits for blacks and whites. The relationship of laboratory to clinical status in blacks needs further study.
Our report has several limitations. First, total serum T4 only was measured in this study so that thyroid status is less certain than if free T4 concentration or index was available. Second, the study is cross-sectional and hence does not include individual changes over time. Third, 24-h urine samples could not be logistically carried out for a better assessment of iodine intake. Fourth, thyroid studies were not done on children under the age of 12 yr. Fifth, the study of noninstitutionalized people may have excluded some individuals at higher risk for thyroid disease. The oversampling of older people may have compensated for this to some extent. Finally, the presence of thyroid disease, goiter, or use of thyroid or other medication was self-reported and thyroid gland size (or the presence of goiter), and a detailed history was not obtained at the time of the examination.
The decrease in median UI in the U.S. between 1971–1974 and 1988–1994 prompted us to examine the relationship of low UI concentrations in individuals and evidence of hypothyroidism, but we found no association. The increase in the serum TSH concentration associated with a higher iodine intake may result from the adverse effect of excess iodine on thyroid function in persons with underlying thyroid disease such as Hashimoto’s thyroiditis, history of subacute thyroiditis (5), or silent postpartum lymphocytic thyroiditis (42). The spot UI concentrations as collected are a better measure of the iodine nutrition in a population than in the individuals tested because they represent intake over a short period of time. TSH elevation is not a sensitive indicator of iodine deficiency in the U.S. at this time.
In conclusion, TSH and the prevalence of antithyroid antibodies are greater in females, increase with age, and are greater in whites and Mexican Americans than in blacks. TgAb alone in the absence of TPOAb is not significantly associated with thyroid disease. The lower prevalence of thyroid antibodies and lower TSH concentrations in blacks need more research to relate these findings to clinical status. The high prevalence of elevated serum TSH and antithyroid antibodies in the United States, especially in women and the elderly, suggests that thyroid disease should be considered during routine evaluation of this susceptible population and should be followed by appropriate detection and treatment. The finding that a large proportion of the U.S. population unknowingly have laboratory evidence of either hypothyroidism or hyperthyroidism supports the usefulness of screening for early detection (43). In the elderly and women of perimenopausal age, further research should be conducted to determine whether treatment of subclinical thyroid disease will be of benefit in preventing the associated diseases related to older age, such as osteoporosis, cardiovascular disease, hyperlipidemia, and neurologic disorders. Although we were not able to find a significant relationship between low iodine intake and elevated TSH in the present study, it is incumbent upon the U.S. to continue monitoring the status of iodine nutrition in the population.
Footnotes
Abbreviations: I/Cr, Iodine/g creatinine; TgAb, antithyroglobulin; TPOAb, antithyroperoxidase; UI, urinary iodine.
Received February 27, 2001.
Accepted October 1, 2001.
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Y. Ban, D. A. Greenberg, T. F. Davies, E. Jacobson, E. Concepcion, and Y. Tomer 'Linkage Analysis of Thyroid Antibody Production: Evidence for Shared Susceptibility to Clinical Autoimmune Thyroid Disease J. Clin. Endocrinol. Metab., September 1, 2008; 93(9): 3589 - 3596. [Abstract] [Full Text] [PDF]
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 M. Chonchol, G. Lippi, G. Salvagno, G. Zoppini, M. Muggeo, and G. Targher Prevalence of Subclinical Hypothyroidism in Patients with Chronic Kidney Disease Clin. J. Am. Soc. Nephrol., September 1, 2008; 3(5): 1296 - 1300. [Abstract] [Full Text] [PDF]
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 S. Gopalakrishnan, P. K. Chugh, M. Chhillar, V. K. Ambardar, M. Sahoo, and R. Sankar Goitrous Autoimmune Thyroiditis in a Pediatric Population: A Longitudinal Study Pediatrics, September 1, 2008; 122(3): e670 - e674. [Abstract] [Full Text] [PDF]
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S. Razvi, A. Shakoor, M. Vanderpump, J. U. Weaver, and S. H. S. Pearce The Influence of Age on the Relationship between Subclinical Hypothyroidism and Ischemic Heart Disease: A Metaanalysis J. Clin. Endocrinol. Metab., August 1, 2008; 93(8): 2998 - 3007. [Abstract] [Full Text] [PDF]
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 J. Chevrier, B. Eskenazi, N. Holland, A. Bradman, and D. B. Barr Effects of Exposure to Polychlorinated Biphenyls and Organochlorine Pesticides on Thyroid Function during Pregnancy Am. J. Epidemiol., August 1, 2008; 168(3): 298 - 310. [Abstract] [Full Text] [PDF]
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K. N. Carroll, P. G. Arbogast, J. A. Dudley, and W. O. Cooper Increase in Incidence of Medically Treated Thyroid Disease in Children With Down Syndrome After Rerelease of American Academy of Pediatrics Health Supervision Guidelines Pediatrics, August 1, 2008; 122(2): e493 - e498. [Abstract] [Full Text] [PDF]
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N. Ochs, R. Auer, D. C. Bauer, D. Nanchen, J. Gussekloo, J. Cornuz, and N. Rodondi Meta-analysis: Subclinical Thyroid Dysfunction and the Risk for Coronary Heart Disease and Mortality Ann Intern Med, June 3, 2008; 148(11): 832 - 845. [Abstract] [Full Text] [PDF]
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C. Dosiou, G. D Sanders, S. S Araki, and L. M Crapo Screening pregnant women for autoimmune thyroid disease: a cost-effectiveness analysis. Eur. J. Endocrinol., June 1, 2008; 158(6): 841 - 851. [Abstract] [Full Text] [PDF]
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 J. L. Kitzmiller, J. M. Block, F. M. Brown, P. M. Catalano, D. L. Conway, D. R. Coustan, E. P. Gunderson, W. H. Herman, L. D. Hoffman, M. Inturrisi, et al. Managing Preexisting Diabetes for Pregnancy: Summary of evidence and consensus recommendations for care Diabetes Care, May 1, 2008; 31(5): 1060 - 1079. [Full Text] [PDF]
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Y. Li, D. Teng, Z. Shan, X. Teng, H. Guan, X. Yu, C. Fan, W. Chong, F. Yang, H. Dai, et al. Antithyroperoxidase and Antithyroglobulin Antibodies in a Five-Year Follow-Up Survey of Populations with Different Iodine Intakes J. Clin. Endocrinol. Metab., May 1, 2008; 93(5): 1751 - 1757. [Abstract] [Full Text] [PDF]
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 L. G. T. Morris, A. G. Sikora, D. Myssiorek, and M. D. DeLacure The Basis of Racial Differences in the Incidence of Thyroid Cancer Ann. Surg. Oncol., April 1, 2008; 15(4): 1169 - 1176. [Abstract] [Full Text] [PDF]
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T. E. Hamilton, S. Davis, L. Onstad, and K. J. Kopecky Thyrotropin Levels in a Population with No Clinical, Autoantibody, or Ultrasonographic Evidence of Thyroid Disease: Implications for the Diagnosis of Subclinical Hypothyroidism J. Clin. Endocrinol. Metab., April 1, 2008; 93(4): 1224 - 1230. [Abstract] [Full Text] [PDF]
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C. S. Fox, M. J. Pencina, R. B. D'Agostino, J. M. Murabito, E. W. Seely, E. N. Pearce, and R. S. Vasan Relations of Thyroid Function to Body Weight: Cross-sectional and Longitudinal Observations in a Community-Based Sample Arch Intern Med, March 24, 2008; 168(6): 587 - 592. [Abstract] [Full Text] [PDF]
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E. E. Wasserman, K. Nelson, N. R. Rose, W. Eaton, J. P. Pillion, E. Seaberg, M. V. Talor, L. Burek, A. Duggan, and R. H. Yolken Maternal Thyroid Autoantibodies during the Third Trimester and Hearing Deficits in Children: An Epidemiologic Assessment Am. J. Epidemiol., March 15, 2008; 167(6): 701 - 710. [Abstract] [Full Text] [PDF]
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A. Kondrashova, H. Viskari, A.-M. Haapala, T. Seiskari, P. Kulmala, J. Ilonen, M. Knip, and H. Hyoty Serological Evidence of Thyroid Autoimmunity among Schoolchildren in Two Different Socioeconomic Environments J. Clin. Endocrinol. Metab., March 1, 2008; 93(3): 729 - 734. [Abstract] [Full Text] [PDF]
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E. N. Pearce, P. W. F. Wilson, Q. Yang, R. S. Vasan, and L. E. Braverman Thyroid Function and Lipid Subparticle Sizes in Patients with Short-Term Hypothyroidism and a Population-Based Cohort J. Clin. Endocrinol. Metab., March 1, 2008; 93(3): 888 - 894. [Abstract] [Full Text] [PDF]
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M. R. Haymart, D. J. Repplinger, G. E. Leverson, D. F. Elson, R. S. Sippel, J. C. Jaume, and H. Chen Higher Serum Thyroid Stimulating Hormone Level in Thyroid Nodule Patients Is Associated with Greater Risks of Differentiated Thyroid Cancer and Advanced Tumor Stage J. Clin. Endocrinol. Metab., March 1, 2008; 93(3): 809 - 814. [Abstract] [Full Text] [PDF]
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J. Karmisholt and P. Laurberg Serum TSH and serum thyroid peroxidase antibody fluctuate in parallel and high urinary iodine excretion predicts subsequent thyroid failure in a 1-year study of patients with untreated subclinical hypothyroidism Eur. J. Endocrinol., February 1, 2008; 158(2): 209 - 215. [Abstract] [Full Text] [PDF]
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B. Biondi and D. S. Cooper The Clinical Significance of Subclinical Thyroid Dysfunction Endocr. Rev., February 1, 2008; 29(1): 76 - 131. [Abstract] [Full Text] [PDF]
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V. Fatourechi Upper Limit of Normal Serum Thyroid-Stimulating Hormone: A Moving and Now an Aging Target? J. Clin. Endocrinol. Metab., December 1, 2007; 92(12): 4560 - 4562. [Full Text] [PDF]
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M. I. Surks and J. G. Hollowell Age-Specific Distribution of Serum Thyrotropin and Antithyroid Antibodies in the U.S. Population: Implications for the Prevalence of Subclinical Hypothyroidism J. Clin. Endocrinol. Metab., December 1, 2007; 92(12): 4575 - 4582. [Abstract] [Full Text] [PDF]
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 M. Humar, H. Dohrmann, P. Stein, N. Andriopoulos, U. Goebel, B. Heimrich, M. Roesslein, R. Schmidt, C. I. Schwer, A. Hoetzel, et al. Repression of T-Cell Function by Thionamides Is Mediated by Inhibition of the Activator Protein-1/Nuclear Factor of Activated T-Cells Pathway and Is Associated with a Common Structure Mol. Pharmacol., December 1, 2007; 72(6): 1647 - 1656. [Abstract] [Full Text] [PDF]
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C. A. Spencer, J. G. Hollowell, M. Kazarosyan, and L. E. Braverman National Health and Nutrition Examination Survey III Thyroid-Stimulating Hormone (TSH)-Thyroperoxidase Antibody Relationships Demonstrate That TSH Upper Reference Limits May Be Skewed by Occult Thyroid Dysfunction J. Clin. Endocrinol. Metab., November 1, 2007; 92(11): 4236 - 4240. [Abstract] [Full Text] [PDF]
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R. Stricker, M Echenard, R Eberhart, M-C Chevailler, V Perez, F A Quinn, and R. Stricker Evaluation of maternal thyroid function during pregnancy: the importance of using gestational age-specific reference intervals Eur. J. Endocrinol., October 1, 2007; 157(4): 509 - 514. [Abstract] [Full Text] [PDF]
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A. R. Cappola Subclinical Thyroid Dysfunction and the Heart J. Clin. Endocrinol. Metab., September 1, 2007; 92(9): 3404 - 3405. [Full Text] [PDF]
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S. L. La'ulu and W. L. Roberts Second-Trimester Reference Intervals for Thyroid Tests: The Role of Ethnicity Clin. Chem., September 1, 2007; 53(9): 1658 - 1664. [Abstract] [Full Text] [PDF]
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J. H. Li, R. E. Safford, J. F. Aduen, M. G. Heckman, J. E. Crook, and C. D. Burger Pulmonary Hypertension and Thyroid Disease Chest, September 1, 2007; 132(3): 793 - 797. [Abstract] [Full Text] [PDF]
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I. Bulow Pedersen, P. Laurberg, N. Knudsen, T. Jorgensen, H. Perrild, L. Ovesen, and L. B. Rasmussen An Increased Incidence of Overt Hypothyroidism after Iodine Fortification of Salt in Denmark: A Prospective Population Study J. Clin. Endocrinol. Metab., August 1, 2007; 92(8): 3122 - 3127. [Abstract] [Full Text] [PDF]
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Subsection Reports J. Clin. Endocrinol. Metab., August 1, 2007; 92(8_suppl): s8 - s47. [Full Text] [PDF]
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M. Abalovich, N. Amino, L. A. Barbour, R. H. Cobin, L. J. De Groot, D. Glinoer, S. J. Mandel, and A. Stagnaro-Green Management of Thyroid Dysfunction during Pregnancy and Postpartum: An Endocrine Society Clinical Practice Guideline J. Clin. Endocrinol. Metab., August 1, 2007; 92(8_suppl): s1 - s47. [Abstract] [Full Text] [PDF]
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G. Iervasi, S. Molinaro, P. Landi, M. C. Taddei, E. Galli, F. Mariani, A. L'Abbate, and A. Pingitore Association Between Increased Mortality and Mild Thyroid Dysfunction in Cardiac Patients Arch Intern Med, July 23, 2007; 167(14): 1526 - 1532. [Abstract] [Full Text] [PDF]
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J. Meyerovitch, P. Rotman-Pikielny, M. Sherf, E. Battat, Y. Levy, and M. I. Surks Serum Thyrotropin Measurements in the Community: Five-Year Follow-up in a Large Network of Primary Care Physicians Arch Intern Med, July 23, 2007; 167(14): 1533 - 1538. [Abstract] [Full Text] [PDF]
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G. Y. Gandhi, R. Basu, A. Dispenzieri, A. Basu, V. M. Montori, and M. D. Brennan Endocrinopathy in POEMS Syndrome: The Mayo Clinic Experience Mayo Clin. Proc., July 1, 2007; 82(7): 836 - 842. [Abstract] [Full Text] [PDF]
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 J. H. Goodman and M. E. Gilbert Modest Thyroid Hormone Insufficiency during Development Induces a Cellular Malformation in the Corpus Callosum: A Model of Cortical Dysplasia Endocrinology, June 1, 2007; 148(6): 2593 - 2597. [Abstract] [Full Text] [PDF]
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G. C. Gonzalez, I. Capel, J. Rodriguez-Espinosa, D. Mauricio, A. de Leiva, and A. Perez Thyroid Autoimmunity at Onset of Type 1 Diabetes as a Predictor of Thyroid Dysfunction Diabetes Care, June 1, 2007; 30(6): 1611 - 1612. [Full Text] [PDF]
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M. D. Gammage, J. V. Parle, R. L. Holder, L. M. Roberts, F. D. R. Hobbs, S. Wilson, M. C. Sheppard, and J. A. Franklyn Association Between Serum Free Thyroxine Concentration and Atrial Fibrillation Arch Intern Med, May 14, 2007; 167(9): 928 - 934. [Abstract] [Full Text] [PDF]
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J. E. Haddow, M. R. McClain, G. E. Palomaki, and J. G. Hollowell Urine Iodine Measurements, Creatinine Adjustment, and Thyroid Deficiency in an Adult United States Population J. Clin. Endocrinol. Metab., March 1, 2007; 92(3): 1019 - 1022. [Abstract] [Full Text] [PDF]
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E. Jensen, O. Blaabjerg, P. H. Petersen, and L. Hegedus Sampling Time Is Important but May Be Overlooked in Establishment and Use of Thyroid-Stimulating Hormone Reference Intervals Clin. Chem., February 1, 2007; 53(2): 355 - 356. [Full Text] [PDF]
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 O.E. Okosieme, R.C. Taylor, A.E. Ohwovoriole, A.B. Parkes, and J.H. Lazarus Prevalence of thyroid antibodies in Nigerian patients QJM, February 1, 2007; 100(2): 107 - 112. [Abstract] [Full Text] [PDF]
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D. S. Cooper Approach to the Patient with Subclinical Hyperthyroidism J. Clin. Endocrinol. Metab., January 1, 2007; 92(1): 3 - 9. [Abstract] [Full Text] [PDF]
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S. Wilson, J. V. Parle, L. M. Roberts, A. K. Roalfe, F. D. R. Hobbs, P. Clark, M. C. Sheppard, M. D. Gammage, H. M. Pattison, J. A. Franklyn, et al. Prevalence of Subclinical Thyroid Dysfunction and Its Relation to Socioeconomic Deprivation in the Elderly: A Community-Based Cross-Sectional Survey J. Clin. Endocrinol. Metab., December 1, 2006; 91(12): 4809 - 4816. [Abstract] [Full Text] [PDF]
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K. Boelaert, J. Horacek, R. L. Holder, J. C. Watkinson, M. C. Sheppard, and J. A. Franklyn Serum Thyrotropin Concentration as a Novel Predictor of Malignancy in Thyroid Nodules Investigated by Fine-Needle Aspiration J. Clin. Endocrinol. Metab., November 1, 2006; 91(11): 4295 - 4301. [Abstract] [Full Text] [PDF]
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 S G S Krishnan, R Pathalapati, L Kaplan, and R K Cobbs Falsely raised TSH levels due to human anti-mouse antibody interfering with thyrotropin assay Postgrad. Med. J., November 1, 2006; 82(973): e27 - e27. [Abstract] [Full Text] [PDF]
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J.-M. Fernandez-Real, A. Lopez-Bermejo, A. Castro, R. Casamitjana, and W. Ricart Thyroid Function Is Intrinsically Linked to Insulin Sensitivity and Endothelium-Dependent Vasodilation in Healthy Euthyroid Subjects J. Clin. Endocrinol. Metab., September 1, 2006; 91(9): 3337 - 3343. [Abstract] [Full Text] [PDF]
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P. Laurberg, T. Jorgensen, H. Perrild, L. Ovesen, N. Knudsen, I. B. Pedersen, L. B Rasmussen, A. Carle, and P. Vejbjerg The Danish investigation on iodine intake and thyroid disease, DanThyr: status and perspectives. Eur. J. Endocrinol., August 1, 2006; 155(2): 219 - 228. [Abstract] [Full Text] [PDF]
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 K. H. Archbold Sleep Disorders and Attention-Deficit Hyperactivity Disorder in Children: A Missing Differential Diagnosis Journal of the American Psychiatric Nurses Association, August 1, 2006; 12(4): 216 - 224. [Abstract] [PDF]
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 J. L. Johnson Diabetes Control in Thyroid Disease Diabetes Spectr, July 1, 2006; 19(3): 148 - 153. [Abstract] [Full Text] [PDF]
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J. M. Barker Type 1 Diabetes-Associated Autoimmunity: Natural History, Genetic Associations, and Screening J. Clin. Endocrinol. Metab., April 1, 2006; 91(4): 1210 - 1217. [Abstract] [Full Text] [PDF]
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K Poppe, D Glinoer, H Tournaye, U Maniewski, P Haentjens, and B Velkeniers Is systematic screening for thyroid disorders indicated in subfertile men? Eur. J. Endocrinol., March 1, 2006; 154(3): 363 - 366. [Abstract] [Full Text] [PDF]
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 M. Imaizumi, T. Usa, T. Tominaga, K. Neriishi, M. Akahoshi, E. Nakashima, K. Ashizawa, A. Hida, M. Soda, S. Fujiwara, et al. Radiation Dose-Response Relationships for Thyroid Nodules and Autoimmune Thyroid Diseases in Hiroshima and Nagasaki Atomic Bomb Survivors 55-58 Years After Radiation Exposure JAMA, March 1, 2006; 295(9): 1011 - 1022. [Abstract] [Full Text] [PDF]
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A. R. Cappola, L. P. Fried, A. M. Arnold, M. D. Danese, L. H. Kuller, G. L. Burke, R. P. Tracy, and P. W. Ladenson Thyroid Status, Cardiovascular Risk, and Mortality in Older Adults JAMA, March 1, 2006; 295(9): 1033 - 1041. [Abstract] [Full Text] [PDF]
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 S. A. H. Cann Hypothesis: dietary iodine intake in the etiology of cardiovascular disease. J. Am. Coll. Nutr., February 1, 2006; 25(1): 1 - 11. [Abstract] [Full Text] [PDF]
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M. Dorr, D. M. Robinson, H. Wallaschofski, C. Schwahn, U. John, S. B. Felix, and H. Volzke Low Serum Thyrotropin Is Associated with High Plasma Fibrinogen J. Clin. Endocrinol. Metab., February 1, 2006; 91(2): 530 - 534. [Abstract] [Full Text] [PDF]
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K. Zophel, G. Wunderlich, and J. Kotzerke Should We Really Determine a Reference Population for the Definition of Thyroid-Stimulating Hormone Reference Interval? Clin. Chem., February 1, 2006; 52(2): 329 - 330. [Full Text] [PDF]
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D. Giavarina, R. M. Dorizzi, and G. Soffiati Indirect Methods for Reference Intervals Based on Current Data Clin. Chem., February 1, 2006; 52(2): 335 - 337. [Full Text] [PDF]
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E. Grossi, R. Colombo, S. Cavuto, and C. Franzini Indirect Methods for Reference Intervals Based on Current Data: The authors of the article cited above respond: Clin. Chem., February 1, 2006; 52(2): 337 - 338. [Full Text] [PDF]
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A. Carle, P. Laurberg, I. B. Pedersen, N. Knudsen, H. Perrild, L. Ovesen, L. B. Rasmussen, and T. Jorgensen Epidemiology of subtypes of hypothyroidism in Denmark Eur. J. Endocrinol., January 1, 2006; 154(1): 21 - 28. [Abstract] [Full Text] [PDF]
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R. Jorde, K. Waterloo, H. Storhaug, A. Nyrnes, J. Sundsfjord, and T. G. Jenssen Neuropsychological Function and Symptoms in Subjects with Subclinical Hypothyroidism and the Effect of Thyroxine Treatment J. Clin. Endocrinol. Metab., January 1, 2006; 91(1): 145 - 153. [Abstract] [Full Text] [PDF]
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 C. P. Dobson, M. Neuwirth, R. E. Frye, and M. Gorman Index of Suspicion Pediatr. Rev., January 1, 2006; 27(1): 29 - 33. [Full Text] [PDF]
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E. H. Hoogendoorn, A. R. Hermus, F. de Vegt, H. A. Ross, A. L.M. Verbeek, L. A.L.M. Kiemeney, D. W. Swinkels, F. C.G.J. Sweep, and M. den Heijer Thyroid Function and Prevalence of Anti-Thyroperoxidase Antibodies in a Population with Borderline Sufficient Iodine Intake: Influences of Age and Sex Clin. Chem., January 1, 2006; 52(1): 104 - 111. [Abstract] [Full Text] [PDF]
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N. Rodondi, A. B. Newman, E. Vittinghoff, N. de Rekeneire, S. Satterfield, T. B. Harris, and D. C. Bauer Subclinical Hypothyroidism and the Risk of Heart Failure, Other Cardiovascular Events, and Death Arch Intern Med, November 28, 2005; 165(21): 2460 - 2466. [Abstract] [Full Text] [PDF]
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J. P. Walsh, A. P. Bremner, M. K. Bulsara, P. O'Leary, P. J. Leedman, P. Feddema, and V. Michelangeli Subclinical Thyroid Dysfunction as a Risk Factor for Cardiovascular Disease Arch Intern Med, November 28, 2005; 165(21): 2467 - 2472. [Abstract] [Full Text] [PDF]
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O. Gumieniak, S. Hurwitz, T. S. Perlstein, U. C. Ngumezi, P. N. Hopkins, X. Jeunemaitre, and G. H. Williams Aggregation of High-Normal Thyroid-Stimulating Hormone in Hypertensive Families J. Clin. Endocrinol. Metab., November 1, 2005; 90(11): 5985 - 5990. [Abstract] [Full Text] [PDF]
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S. M. McLachlan, Y. Nagayama, and B. Rapoport Insight into Graves' Hyperthyroidism from Animal Models Endocr. Rev., October 1, 2005; 26(6): 800 - 832. [Abstract] [Full Text] [PDF]
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C. A. Spencer, L. M. Bergoglio, M. Kazarosyan, S. Fatemi, and J. S. LoPresti Clinical Impact of Thyroglobulin (Tg) and Tg Autoantibody Method Differences on the Management of Patients with Differentiated Thyroid Carcinomas J. Clin. Endocrinol. Metab., October 1, 2005; 90(10): 5566 - 5575. [Abstract] [Full Text] [PDF]
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L. Wartofsky and R. A Dickey The Evidence for a Narrower Thyrotropin Reference Range Is Compelling J. Clin. Endocrinol. Metab., September 1, 2005; 90(9): 5483 - 5488. [Abstract] [Full Text] [PDF]
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M. I. Surks, G. Goswami, and G. H. Daniels The Thyrotropin Reference Range Should Remain Unchanged J. Clin. Endocrinol. Metab., September 1, 2005; 90(9): 5489 - 5496. [Abstract] [Full Text] [PDF]
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C. E. Behrendt Mild and Moderate-to-Severe COPD in Nonsmokers: Distinct Demographic Profiles Chest, September 1, 2005; 128(3): 1239 - 1244. [Abstract] [Full Text] [PDF]
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J. Kratzsch, G. M. Fiedler, A. Leichtle, M. Brugel, S. Buchbinder, L. Otto, O. Sabri, G. Matthes, and J. Thiery New Reference Intervals for Thyrotropin and Thyroid Hormones Based on National Academy of Clinical Biochemistry Criteria and Regular Ultrasonography of the Thyroid Clin. Chem., August 1, 2005; 51(8): 1480 - 1486. [Abstract] [Full Text] [PDF]
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 M. E. Fisfalen, T. G. Schulze, J. R. DePaulo Jr., L. J. DeGroot, J. A. Badner, and F. J. McMahon Familial Variation in Episode Frequency in Bipolar Affective Disorder Am J Psychiatry, July 1, 2005; 162(7): 1266 - 1272. [Abstract] [Full Text] [PDF]
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J. J. Diez, P. Iglesias, and K. D. Burman Spontaneous Normalization of Thyrotropin Concentrations in Patients with Subclinical Hypothyroidism J. Clin. Endocrinol. Metab., July 1, 2005; 90(7): 4124 - 4127. [Abstract] [Full Text] [PDF]
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