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At 2-year follow-up (Time 2?=?T2) the child's ASD diagnosis was once again revaluated and determined according to DSM-IV-TR criteria. Intellectual/developmental testing was performed in 196 children (27 girls, 169 boys). The large majority (n?=?190) were assessed by the research psychologists at the centre, and a minority (n?=?6) were reassessed by the referral teams psychologists. The mean time between the first http://www.selleckchem.com/products/pf-562271.html cognitive assessment at referral and the follow-up at T2 was 28?months (SD?=?4.6?months). Mean age at referral was 3?years and 2?months (SD?=?8.5?months) and at follow-up 5?years and 6?months (SD?=?8.8?months). During the study period, all children had received some type of early intervention based on applied behaviour analysis (ABA); approximately half the group received the intensive type and the other half received targeted, nonintensive intervention [19]. The PARIS schedule [17, 20] includes, among other things, a DSM-IV-TR [1] diagnostic schedule to check for ASD symptoms, activity level symptoms, expressive speech development and medical disorders. Level of expressive speech was classified into five categories (i) no words (ii) a few words (iii) a few sentences (iv) some speech with or without echolalia and (v) much speech in sentences, mostly communicatively. The Diagnostic Interview for Social and Communication disorders (DISCO 10) is an investigator-based interview and a useful instrument in the ASD diagnostic procedure. The interview covers the broad autism spectrum and has a developmental perspective [21]. The Autistic Behaviour Checklist (ABC) [22], a questionnaire http://www.selleckchem.com/products/VX-765.html pertaining to core symptoms of autism, was used as parent interview. High ABC scores indicate a marked degree of autistic behaviour. Autism spectrum disorder subtypes were classified http://www.selleck.cn/products/azd6738.html as AD, PDD�CNOS/atypical autism or Asperger syndrome. Autistic traits were considered to be present when the child did not meet full criteria for any ASD diagnosis but had definite autistic symptoms or traits. At T1, DQ/IQ-results of the child's cognitive level, according to complete tests or parts of tests, were found for 57% of the children. To establish the level of overall cognitive function, psychological records were scrutinised by the research psychologists for the remaining 43%. The Swedish versions of Griffiths�� Developmental Scales I and/or II [23] were used as a ��template�� for the construction of developmental levels. Broad DQ/IQ (��cognitive group��) status was assigned in the following manner: average intellectual functioning?=?DQ/IQ >84 (AIF), developmental delay/borderline intellectual functioning DQ/IQ 70�C84 (BIF), intellectual disability?=?DQ/IQ