Figure 2.

Serum micronutrient levels of ASD and typically developing children in Chongqing and Hainan. Children were assigned to four groups: ASD-Chongqing (n = 445), TD-Chongqing (n = 201), ASD-Hainan (n = 293), and TD-Hainan (n = 101). The serum concentrations of zinc (A), ferritin (B), folate (C), vitamin B12 (D), vitamin D (F), and vitamin A (E) of children were detected and compared. The values are the means ± SEMs. The one-way ANOVA test was used for the comparison, P-value was adjusted in multiple comparisons by the Bonferroni method. *P < 0.05, **P < 0.01, ***P < 0.001. ASD, autism spectrum disorder; TD, typically developing.