No abstract

Purpose and aim: The overall aim of this study was to examine the relationship between adaptive function and cognitive factors in young adults diagnosed with autism spectrum disorder (ASD) in adult age. Methods: The study included 30 adults (age 18-30) diagnosed with ASD in adulthood. All participants were clinically referred to an adult psychiatric clinic for assessment. Adaptive functioning was measured with Adaptive Behavior Assessment System -2nd edition (parent version). Wechsler scales of intelligence and Delis-Kaplan Executive Function System were used to measure intelligence and executive function. Results: We found considerable adaptive functioning deficits regardless of Full Scale Intelligence Quotient (FSIQ) level. FSIQ, working memory and processing speed were positively associated with adaptive functioning. No associations were found between adaptive functioning and cognitive flexibility, inhibition, word generation or shifting. Regression analysis showed that working memory and processing speed predicted 23% of the variance in adaptive functioning in this group. Conclusions: The results suggest that cognitive dysfunction could be an important area for intervention to improve adaptive functioning in ASD.

Background Patients with ‘underlying’ autism spectrum disorder (ASD) constitute a significant minority in adult out-patient psychiatry. Diagnoses of previously unrecognised ASD are increasing in adults. Characteristics of patients with autism within adult out-patient psychiatry have not been sufficiently explored, and there have not been any systematic comparisons of characteristics between patients with and those without autism within adult out-patient psychiatric populations. Aims To examine psychiatrically relevant characteristics in autistic adult psychiatric out-patients, and to compare the characteristics with non-autistic adult psychiatric out-patients. Method We assessed 90 patients who were referred to a Swedish psychiatric out-patient clinic and screened for ASD during 2019–2020. Sixty-three patients met the DSM-5 criteria for ASD or ‘subthreshold’ ASD. The 27 who did not meet the criteria for ASD were used as a comparison group. Assessments were made with structured and well-validated instruments, including parent ratings of developmental history. Results No differences were found between the groups regarding self-reported sociodemographic variables. The ASD group showed a higher number of co-occurring psychiatric disorders than the non-ASD group (t(88) = 5.17, 95% CI 1.29–2.91, d = 1.19). Functional level was lower in the ASD group (t(88) = −2.66, 95% CI −9.46 to −1.27, d = −0.73), and was predicted by the number of co-occurring psychiatric disorders. Conclusions The results underscore the need for thorough assessment of psychiatric disorders in autistic patients in adult psychiatric services. ASD should be considered as a possible ‘underlying’ condition in adult psychiatry, and there is no easy way of ruling out ASD in this population.