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High comorbidity and diagnostic overlap between autism spectrum disorder and social anxiety disorder have been documented. We examined if differences in adaptive behavior, essential for daily functioning, could differentiate these conditions among young university students. Eighty-eight autistic and 123 non-autistic undergraduates were categorized into four groups: autistic individuals: with low (n = 26)/high (n = 62) social anxiety (SA) symptoms; non-autistic: with low (n = 63)/high (n = 60) SA. The Adaptive Behavior Assessment System (ABAS) was utilized to assess three domains of adaptive skills essential for daily functioning: conceptual (academic and communication abilities), social (relationships and understanding social cues), and practical (everyday tasks such as self-care and work). Autistic students, regardless of SA level, reported ABAS scores within the low average range for the conceptual adaptive behavior domain, while non-autistic students had average scores. In terms of ABAS social adaptive behavior scores, both autistic and non-autistic groups with high levels of SA had low average scores. Conversely, those with low SA, whether autistic or non-autistic, exhibited average scores. These results were supported by the regression analyses outcomes. While autism traits and social anxiety showed medium (β=-0.37) and small (β=-0.27) effects, respectively, on conceptual adaptive scores, only social anxiety exhibited significant (medium) effects on social (β=-0.41) and practical (β=-0.34) adaptive scores. Reduced conceptual skills, previously linked to communication and executive function, may distinguish autism from social anxiety. Implications for research and practice are discussed., Competing Interests: Declaration of competing interest The authors declare no conflicts of interest related to this study. No financial, personal, or professional relationships that could influence the work reported in this manuscript have been disclosed., (Copyright © 2024 Elsevier B.V. All rights reserved.)

The rising prevalence of autism spectrum disorder (ASD) has increased awareness of the need for early diagnosis and intervention; however, not all children are diagnosed at preschool age. In the literature, findings regarding factors that may play a role in later diagnosis are inconsistent. Presence or absence of intellectual disability is a possible factor. This study aimed to identify factors associated with later diagnosis of ASD among children grouped according to low and high cognitive levels. Data of children who were previously diagnosed with ASD between 2002 and 2016 at a national autism center were analyzed. Better cognitive ability, having more siblings, and previous diagnosis of attention-deficit/hyperactivity disorder were predictors of later diagnosis among the entire cohort. Children exhibiting lower cognitive levels (LC-ASD; DQ/IQ < 70; n = 209) were diagnosed much earlier. Among this group, later ASD diagnosis was predicted by poorer adaptive behavior, more severe restricted and repetitive behaviors, and previous diagnosis of epilepsy. In the higher cognitive level group (HC-ASD; DQ/IQ ≥ 70; n = 321), familial variables and more severe social impairments were predictors of later ASD diagnosis. Clinicians should be aware of variables that may affect ASD diagnostic age among children with varying cognitive abilities., (Copyright © 2022. Published by Elsevier B.V.)

In recent years, more young adults with ASD are attending post-secondary education, and several support programs have been proposed for this population. However, research regarding the long-term effects of university enrollment on outcomes among students with ASD is scarce. This study examined adaptive behavior and psychiatric symptoms during the first semester of two consecutive academic years (T1, T2) among 39 students with ASD, 29 students without ASD and high levels of social anxiety symptoms (High SA), and 32 students without ASD and low levels of SA symptoms (Low SA). Students with ASD participated in a university support program and resided with a peer mentor student without ASD, which encouraged social interaction. At T1, students with ASD reported lower levels of adaptive behavior and higher levels of social anxiety and obsessive-compulsive symptoms compared to the other groups. However, at follow-up (T2), significantly higher conceptual adaptive skill levels (specifically communication skills) and significantly lower depression symptom levels from T1 were reported only among students with ASD. The levels of social anxiety and obsessive-compulsive symptoms at T1 were negatively associated with adaptive functioning a year later (T2). Implications regarding adults with ASD attending university are discussed., (Copyright © 2022. Published by Elsevier B.V.)

High variability in adaptive behavior in cognitively-able adults with autism spectrum disorder has been previously reported, and may be caused by the high prevalence of psychiatric comorbidity in this population. This study's goals were to examine self-reported psychiatric symptoms in students with ASD, and to identify their relative contribution to the variance in adaptive behaviors. The study population included 95 students: 55 diagnosed with ASD (4 females; age range 18-34) who participated in a university integration program (ASD group), and 40 regularly matriculated students (non-ASD group, 7 females; age range 20-36). The ASD group showed a lower adaptive skill level than the non-ASD group as measured by the Adaptive Behavior Assessment System (GAC-ABAS). Significantly higher scores for the ASD group were found for social anxiety, trait anxiety, obsessive-compulsive symptoms, and depression symptoms. The level of adaptive skills correlated negatively and significantly with the severity of social anxiety symptoms in both groups and with severity of obsessive-compulsive symptoms only in the ASD group. Additionally, in a regression model, significant contributions of having an ASD diagnosis and severity of social anxiety explained 41.7% of the variance in adaptive skills. Adequate evaluation and treatment, if needed, are recommended in this population., (Copyright © 2019 Elsevier B.V. All rights reserved.)