Phenotypic elements of autism spectrum disorder can be masked by attention-deficit/hyperactivity disorder symptoms, potentially leading to a misdiagnosis or delaying an autism spectrum disorder diagnosis. This study explored differences in the age of autism spectrum disorder diagnosis between participants with previously diagnosed…

Research has highlighted potential differences in the phenotypic and clinical presentation of autism spectrum conditions across sex. Furthermore, the measures utilised to evaluate autism spectrum conditions may be biased towards the male autism phenotype. It is important to determine whether these instruments measure the autism phenotype…

The prevalence of autism spectrum disorder (ASD) in adults is estimated to be at least 1% (Brugha et al., 2011), yet almost all ASD research focuses on children. Adult intervention studies, in particular, are few in number and poor in quality (Bishop-Fitzpatrick, Minshew, & Eack, 2013), and support networks for adults with ASD are much more…