Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil)
ABSTRACT Objective: Although some previous data have suggested a high iodine intake in Brazil, the prevalence of antithyroperoxidase antibodies (TPOAb) in the country is compatible with rates from countries with adequate iodine intake. This observation emphasizes the importance of knowing the incid...
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| Format: | Article |
| Language: | English |
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Brazilian Society of Endocrinology and Metabolism
2021-11-01
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| Series: | Archives of Endocrinology and Metabolism |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2359-39972021000600832&tlng=en |
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| author | Isabela M. Benseñor Carolina Castro Porto Silva Janovsky Alessandra C. Goulart Itamar de Souza Santos Maria de Fátima Haueisen Sander Diniz Bianca de Almeida-Pititto José Augusto Sgarbi Paulo A. Lotufo |
| author_facet | Isabela M. Benseñor Carolina Castro Porto Silva Janovsky Alessandra C. Goulart Itamar de Souza Santos Maria de Fátima Haueisen Sander Diniz Bianca de Almeida-Pititto José Augusto Sgarbi Paulo A. Lotufo |
| author_sort | Isabela M. Benseñor |
| collection | DOAJ |
| description | ABSTRACT Objective: Although some previous data have suggested a high iodine intake in Brazil, the prevalence of antithyroperoxidase antibodies (TPOAb) in the country is compatible with rates from countries with adequate iodine intake. This observation emphasizes the importance of knowing the incidence of TPOAb in Brazil. Materials and methods: This prospective analysis included euthyroid participants with negative TPOAb at baseline and a thyroid function assessment at a 4-year follow-up. TPOAb was measured by electrochemiluminescence and considered positive when titers were ≥34 IU/mL. TSH and free T4 (FT4) levels were determined by a third-generation immunoenzymatic assay. The incidence of TPOAb is expressed in percentage per year or as a cumulative incidence within the 4-year follow-up period. Results: Of 8,922 euthyroid participants (mean age 51.1 years; 50.9% women) with a negative TPOAb test at baseline, 130 presented incident TPOAb at the 4-year follow-up, yielding an annual incidence of TPOAb of 0.38%/year (95% confidence interval [95% CI], 0.37-0.39%/year) and a cumulative incidence over 4 years of 1.46% (95% CI, 1.21-1.71%). In men, the annual incidence was 0.32% (95% CI, 0.31-0.33%), and the cumulative incidence over 4 years was 1.23% (95% CI, 0.90-1.56%). In women, the annual incidence was 0.43%/year (95% CI, 0.42-0.44%/year) and the cumulative incidence over 4 years was 1.67% (95% CI, 1.30-2.04%). The only factor associated with incident TPOAb was the occurrence of thyroid diseases at follow-up. No differences in TPOAb incidence were detected across ELSA-Brasil research centers. Conclusion: Based on the results of this study, the incidence of TPOAb per year and at a 4-year follow-up period are compatible with those of a country with adequate iodine intake. |
| first_indexed | 2024-04-11T17:13:55Z |
| format | Article |
| id | doaj.art-ab16f8f734ea45059a13e29077592770 |
| institution | Directory Open Access Journal |
| issn | 2359-4292 |
| language | English |
| last_indexed | 2024-04-11T17:13:55Z |
| publishDate | 2021-11-01 |
| publisher | Brazilian Society of Endocrinology and Metabolism |
| record_format | Article |
| series | Archives of Endocrinology and Metabolism |
| spelling | doaj.art-ab16f8f734ea45059a13e290775927702022-12-22T04:12:49ZengBrazilian Society of Endocrinology and MetabolismArchives of Endocrinology and Metabolism2359-42922021-11-0165683284010.20945/2359-3997000000422Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil)Isabela M. Benseñorhttps://orcid.org/0000-0002-6723-5678Carolina Castro Porto Silva Janovskyhttps://orcid.org/0000-0001-9383-7907Alessandra C. Goularthttps://orcid.org/0000-0003-1076-5210Itamar de Souza Santoshttps://orcid.org/0000-0003-3212-8466Maria de Fátima Haueisen Sander Dinizhttps://orcid.org/0000-0001-9146-5003Bianca de Almeida-Pitittohttps://orcid.org/0000-0002-5907-5459José Augusto Sgarbihttps://orcid.org/0000-0001-7187-984XPaulo A. Lotufohttps://orcid.org/0000-0002-4856-8450ABSTRACT Objective: Although some previous data have suggested a high iodine intake in Brazil, the prevalence of antithyroperoxidase antibodies (TPOAb) in the country is compatible with rates from countries with adequate iodine intake. This observation emphasizes the importance of knowing the incidence of TPOAb in Brazil. Materials and methods: This prospective analysis included euthyroid participants with negative TPOAb at baseline and a thyroid function assessment at a 4-year follow-up. TPOAb was measured by electrochemiluminescence and considered positive when titers were ≥34 IU/mL. TSH and free T4 (FT4) levels were determined by a third-generation immunoenzymatic assay. The incidence of TPOAb is expressed in percentage per year or as a cumulative incidence within the 4-year follow-up period. Results: Of 8,922 euthyroid participants (mean age 51.1 years; 50.9% women) with a negative TPOAb test at baseline, 130 presented incident TPOAb at the 4-year follow-up, yielding an annual incidence of TPOAb of 0.38%/year (95% confidence interval [95% CI], 0.37-0.39%/year) and a cumulative incidence over 4 years of 1.46% (95% CI, 1.21-1.71%). In men, the annual incidence was 0.32% (95% CI, 0.31-0.33%), and the cumulative incidence over 4 years was 1.23% (95% CI, 0.90-1.56%). In women, the annual incidence was 0.43%/year (95% CI, 0.42-0.44%/year) and the cumulative incidence over 4 years was 1.67% (95% CI, 1.30-2.04%). The only factor associated with incident TPOAb was the occurrence of thyroid diseases at follow-up. No differences in TPOAb incidence were detected across ELSA-Brasil research centers. Conclusion: Based on the results of this study, the incidence of TPOAb per year and at a 4-year follow-up period are compatible with those of a country with adequate iodine intake.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2359-39972021000600832&tlng=enTPOAbincidencethyroid functionautoimmune thyroid diseasethyroid disease |
| spellingShingle | Isabela M. Benseñor Carolina Castro Porto Silva Janovsky Alessandra C. Goulart Itamar de Souza Santos Maria de Fátima Haueisen Sander Diniz Bianca de Almeida-Pititto José Augusto Sgarbi Paulo A. Lotufo Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) Archives of Endocrinology and Metabolism TPOAb incidence thyroid function autoimmune thyroid disease thyroid disease |
| title | Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) |
| title_full | Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) |
| title_fullStr | Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) |
| title_full_unstemmed | Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) |
| title_short | Incidence of TPOAb over a 4-year follow-up period: results from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) |
| title_sort | incidence of tpoab over a 4 year follow up period results from the brazilian longitudinal study of adult health elsa brasil |
| topic | TPOAb incidence thyroid function autoimmune thyroid disease thyroid disease |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2359-39972021000600832&tlng=en |
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