Serum (A), hair (B), and urinary (C) magnesium levels in children with ADHD, ASD, as well as neurotypical controls. Data expressed as median (line), IQR (box), and non-outlier range (whiskers). p values are provided according to Bonferroni corrected ANCOVA (A, B) or Kruskal-Wallis test (C), being considered significant at *p<0.05. ADHD: attention-deficit/hyperactivity disorder, ASD: autism spectrum disorder, IQR: interquartile range, ANCOVA: analysis of covariance, Mg: magnesium.