Urinary Porphyrin Profiles and Trace Element Imbalances in Children with Autism Spectrum Disorders: Insights into Environmental and Metabolic Biomarkers.

p -values for most porphyrins were highly significant (uroporphyrins p = 1.3 × 10 −6 , pentaporphyrins p = 9.21 × 10 −8 , total porphyrins p = 2.61 × 10 −5 ) when comparing the youngest (≤5 years) and oldest (>10 years) age groups.

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Mercury (Hg) was detected in fewer samples and did not reach statistical significance but remains potentially biologically relevant ( Table 7 ).

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