Figure 2.
Head circumference (HC) data for the autism (AUT) and typically developing (TD) groups (A), pervasive developmental disorder–not otherwise specified (PDD-NOS) and TD groups (B), global developmental delay (GDD) and TD groups (C), and Other (OTH) and TD groups (D). For each pair, graphs on the left illustrate spline-based Bayesian multilevel growth curves for each of the clinical groups and TD controls. The boundaries represent 95% credible bands. Graphs on the right describe differences between means of a given clinical group and TD controls from birth to 24 months. Divergence of the credible band from 0 represents a significant difference between the means at P≤.05 (2-sided). (For explanation of “Other” see “Participants” subsection of the “Methods” section.)