No significant Pearson correlations observed between serum iron markers and PSG parameters. PLM Index ¼ periodic limb movement index; PLMS ¼ total
period limb movements of sleep; PSG ¼ polysomnography; WASO ¼ wake after sleep onset. Additional iron markers available for a subset of the sample,
n ¼ 60 (65% of autism, 56% of typically developing, 38% of developmental delay). All Pearson correlations .25 and P > 0.01. (The color version of this figure
is available in the online edition.)