The investigators propose a multicenter retrospective study to assess clinical, biochemical, and auxological characteristics at diagnosis and during follow-up in a cohort of Caucasian pediatric patients diagnosed with autoimmune hyperthyroidism before puberty. These prepubertal patients will be compared with a control group of post-pubertal patients with Graves' disease. This study aims to enhance the understanding of autoimmune hyperthyroidism in prepubertal patients by providing a detailed evaluation of disease onset, therapeutic response, and growth-related outcomes. The inclusion of a carefully matched post-pubertal control group will allow for robust comparative analysis and identification of age-dependent clinical patterns and prognostic indicators, ultimately supporting more tailored and effective management strategies in pediatric populations at this particular age.
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Number of clinical signs of hyperthyroidism at diagnosis
Timeframe: Day 0 (retrospective assessment at diagnosis)
Number of clinical symptoms at diagnosis
Timeframe: Day 0
Serum free triiodothyronine (FT3) levels at diagnosis
Timeframe: Day 0
Serum free thyroxine (FT4) levels at diagnosis
Timeframe: Day 0
Serum thyroid-stimulating hormone (TSH) levels at diagnosis
Timeframe: Day 0
Serum TSH receptor antibody (TRAb) levels at diagnosis
Timeframe: Day 0
Thyroid autoantibody positivity at diagnosis (TPOAb and TgAb)
Timeframe: Day 0