This study examined whether total scores in the Japanese version of the AQ (AQ-J) could discriminate between an ASD group, an SCD group, and a neurotypical (NT) group. However, few studies have investigated the AQ cutoff score for screening ASD in the DSM-5, and no studies have attempted to apply the AQ to screen SCD. The results showed that the mean AQ score was 17.0 (confidence interval : 16.4 to 17.4) in the nonclinical group and 35.2 (CI: 34.5 to 35.9) in the ASC group. A systematic review focused on the AQ analyzed 73 papers, including 6,934 nonclinical participants and 1,963 clinical cases with matched autism spectrum condition (ASC). Based on the autism spectrum hypothesis, this scale can be used not only for clinical screening to determine whether or not an individual fits ASD, the degree of the disorder, and whether a precise diagnosis should be made but also to measure individual differences in autistic tendencies in normal subjects, which is considered beneficial in both diagnosis and research. (2001) is a self-response screening tool for autism tendencies in adults with normal intelligence. The Autism Spectrum Quotient (AQ) created by Baron-Cohen et al. Although the distinction between SCD and ASD is controversial, at least the DSM-5 indicates that ASD and SCD are independent diagnostic concepts, so it is worthwhile to distinguish between these groups and examine whether there are differences in prognosis and comorbidities. ![]() SCD is included in the macro category of communication disorders, characterized by a primary difficulty with broadly conceived pragmatic abilities, including language disorders, speech sound disorders, and childhood-onset fluency disorders (stuttering), but not ASD. Social (pragmatic) communication disorder (SCD) is a new disease concept included in the DSM-5, which involves impairments in social communication and social interaction but not restricted, repetitive patterns of behavior, interests, or activities (RRBs). In the Diagnostic and Statistical Manual and Mental Disorders, Fifth Edition (DSM-5), which was revised in 2014, conditions previously diagnosed as autistic disorder, Asperger’s disorder, and unspecified pervasive developmental disorder were unified into autism spectrum disorder (ASD). Our findings suggest the usefulness of the AQ-J in screening for ASD and SCD. The AUC for the ASD and SCD groups was 0.75 the optimum cutoff value was 32 points (sensitivity 67.7%, specificity 71.2%). The AUC for the SCD and NT groups was 0.89, and the optimum cutoff value was 22 points (sensitivity 84.6%, specificity 85.7%). In the ROC analysis for the ASD and NT groups, the area under the curve (AUC) was 0.96, and the optimum cutoff value was 23 points (sensitivity 92.9%, specificity 85.7%). Receiver operating characteristic (ROC) analyses were used to examine AQ-J total score cutoff values to distinguish between ASD and NT groups, SCD and NT groups, and ASD and SCD groups. Participants were 127 ASD patients, 52 SCD patients, and 49 NT individuals. ![]() This study examined whether the Japanese version of the AQ (AQ-J) total scores could discriminate between an ASD group, an SCD group, and a neurotypical (NT) group. However, AQ cutoff scores for screening ASD and SCD in the DSM-5 have not been established. The autism spectrum quotient (AQ) was developed to screen for autism tendencies in adults with normal intelligence. ![]() SCD involves impairments in social communication and social interaction but not restricted, repetitive patterns of behavior, interests, or activities. In the Diagnostic and Statistical Manual and Mental Disorders, Fifth Edition (DSM-5), autism spectrum disorder (ASD) and social (pragmatic) communication disorder (SCD) were described as a new category of psychiatry nosography.
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