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  • Author: Carlo Piccinni x
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Nella Augusta Greggio Endocrinology and Adolescence Unit, Department of Woman and Child Health, University of Padova, Padova, Italy

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Elisa Rossi CINECA – Interuniversity Consortium (Health Service), Bologna, Italy

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Silvia Calabria CORE srl – Collaborative Outcome Research, Bologna, Italy

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Alice Meneghin Endocrinology and Adolescence Unit, Department of Woman and Child Health, University of Padova, Padova, Italy

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Joaquin Gutierrez de Rubalcava Endocrinology and Adolescence Unit, Department of Woman and Child Health, University of Padova, Padova, Italy

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Carlo Piccinni CORE srl – Collaborative Outcome Research, Bologna, Italy

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Antonella Pedrini CORE srl – Collaborative Outcome Research, Bologna, Italy

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Objective

To estimate the prevalence of subclinical hypothyroidism (SH) among children, by using levothyroxine low dosage as disease proxy, and to describe prescription pattern.

Design

An historical cohort study was performed through administrative databases of 12 Italian Local Health Units covering 3,079,141 inhabitants. A cohort of children (aged 0–13 years) was selected in the period 2001–2014. A subgroup of new users (aged 0–9 years) was identified and followed up for 5 years.

Methods

The prevalence was provided as mean value of the whole period, as annual trend, by patient gender and age. Demographic details, information on levothyroxine dosage, comorbidities and co-medications were provided. Therapy duration and medication persistence were evaluated among new users.

Results

644 children treated with levothyroxine low dosage was selected, with a mean annual prevalence of 0.20 per 1000 children. The temporal trend of prevalence was stable, with a slight reduction in the 2005–2008. Prevalence by age showed an increase after 10 years. Patients were treated with an average annual dose of 4290 µg/year and 66.9% of children were affected by comorbidities. Among 197 new users, 62.9% received therapy only for one year, whereas out of those treated two or more years, 89.0% resulted persistent to the therapy.

Conclusions

This study provides real-world epidemiology of SH among children, and it depicts the clinical and therapeutic characteristics of these subjects. Its findings showed that the SH treatment of this disorder was widely variable, also due to lack of evidence concerning paediatric population.

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