FIGURE 4.

Lower intelligence quotient (IQ) significantly associates with worse autism symptoms: Early Learning Composite (ELC, a standard score) versus Social Affect (SA), Repetitive and Restricted Behaviors (RRB) and Total Calibrated Severity Scores (CSS) on the ADOS (all p < 0.01). (a) Data from infants (N = 793) with ASD outcomes, with at least two Mullen assessments (the Mullen scores at the 1st time point are chosen for correlation analyses), (b) infants (N = 813) with ASD outcomes, with 1 and only one Mullen assessment (no overlap with subjects relative to those in (a)). ASD, Autism Spectrum Disorder; ADOS, Autism Diagnostic Observation Schedule