Katusic MZ, Myers SM, Weaver AL, et al. - In this study, an average or higher IQ was evident in nearly half of patients with autism spectrum disorder (ASD).

• From 31,220 individuals in a population-based birth cohort, ASD incident cases were identified by using research-defined autism spectrum disorder, inclusive criteria (ASD-R _I ) and research-defined autism spectrum disorder, narrow criteria (ASD-R _N ).

• Average or higher IQ was present in 59.1% of those with ASD-R _I (n = 890), 51.2% of those with ASD-R _N (n = 453), and 42.8% of those with clinically diagnosed autism spectrum disorder (n = 187).

• A greater probability of having an average or higher IQ was observed in boys with ASD than girls.

• ASD patients with higher IQ remain at risk for not being identified.