![]() Like previous adaptation studies, a two-factor structure was found. The Childhood Autism Spectrum Test (CAST), formerly known as the Childhood Asperger’s Syndrome Test, is a parent-reported questionnaire designed to identify autism spectrum symptoms in children. ![]() A sample of participants received a full diagnostic assessment, conducted blind to screen status. In this validation study, the CAST was distributed to 1925 children aged 5-11 in mainstream Cambridgeshire schools. Correlations were high between the Spanish full and reduced versions of the CAST, and ADI-R (Autism Diagnostic Interview Revised) and ADOS-2 (Autism Diagnostic Observation Schedule, Second Edition). The Childhood Asperger Syndrome Test (CAST) is a parental questionnaire to screen for autism spectrum conditions. Some items showed low discriminating power and these results led us to propose a reduced version with 28 items and a cut-off score of 13, which presented a high sensitivity (85.7%) and specificity (91.16%), a PPV of. The full Spanish version with a cut-off score of 15 presented a high sensitivity (83.9%) and specificity (92.5%), a positive predictive value (PPV) of. The present study explored the sex distribution of scores. Factorial and convergent validity is also assessed. The Childhood Autism Spectrum Test (CAST) (formally known as the Childhood Asperger Screening Test) identifies autism spectrum conditions by measuring social and communication skills. This study provides evidence on its psychometric properties, describe its validity for screening and provides data on its discriminative capabilities in a Spanish sample of 4-12 year-old children from community and clinical settings (N = 1460 and 36, respectively). ![]() Methods Two hundreds and fifty-two typical developing children,and 61 autistic children who were confirmed by psychological clinic of Child Healthcare Clinic,Shenzhen Luohu District Maternal and Child Health Care Hospital who were conformed with diagnosis standards of Diagnostic and Statistical Manual of Mental Disorders Fifth Edition( DSM-5) by using CAST Chinese version were assessed,and the reliability and validity analysis were made on the CAST scale.The receiver operating characteristic curve was drew to determine the optimal threshold value,and the sensitivity, specificity and positive predictive value were calculated.Results CAST Chinese version had good reliability,Cronbach's α was 0.880.Split-half reliability coefficient r was 0.821,and the whole scale calibration reliability coefficient was 0.902.There was statistically significant difference between items and the total score(P<0.05).The consistency between the CAST ≥4 years old children and diagnosis standards of DSM-5 reached 0.884(P=0.000).The consistency 3-<4 years old children and diagnosis standards of DSM-5 reached 0.867 (P=0.000).Among the screening of the children who were ≥4 years old,the cut off was 15 scores that the sensitivity and specificity were best.With the children of 3-<4 years old,a designated cut-point should be 17 scores.Conclusions There are good reliability and validity of CAST,which can be used to mainland China,as well as to screen autistic children more than 3 years old.Summary: The Childhood Autism Spectrum Test (CAST Scott, Baron-Cohen, Bolton & Brayne, 2002) has proved to be a good test for screening autism spectrum disorders (ASD) and social communication problems. Objective To explore the applicability of the childhood autism spectrum test (CAST) of children in Mainland China according to autism screening,in order to provide the effective reference for the identification and diagnosis of autism spectrum disorders of children.
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