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The possibility of person specific identification of diagnosis in the NPR registry started in 2008.The non-ASD group consist of mostly typically developing children, though some children might have other diagnoses.However, controlling for total M-CHAT failures, this male disadvantage was more equivocal and many classically ASD-associated features were found more common in non-ASD.

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On the other hand Baron-Cohen and colleagues, have turned to the general population and suggest that he “systemizing cognitive profile” typically found in males within the general population is reflected in gender differences in autism (Auyeung et al. In line with these studies, which widen the context by which behavioral manifestations of autism are considered by considering population-based phenomena, the present study further extends continuum-based perspectives of ASD-related behaviors in a large population based sample of children between 17 and 30 months.The most frequently reported sex difference in ASD is the disproportionally higher male to female prevalence, consistently reported since the seminal studies by Kanner () reported across studies male to female prevalence ratios ranging from 4.3:1, with 5.5:1 in groups within the normal IQ range.For moderate to severe intellectual disability male to female ratios of 1.33:1 (Mc Carthy et al. While numerous theories have been forwarded to explain the causal mechanisms of this predominantly high male–female ratio in ASD, the topic remains widely debated in the current literature.In total, 40.6 % of invited mothers consented to participate.The cohort comprises 114,500 children and 95,200 mothers.For example, the positive correlation between intellectual disability and severity of symptoms (Carter et al.), combined with the fact that males are more prone to developmental delay have led some to hypothesize that the higher prevalence of autism in males stems from a greater risk of developmental disability (Boyle et al. The exact nature of this relationship is unclear, and studies have found evidence that sex differences in cognitive performance, adaptive abilities and repetitive behaviors do not appear to be ASD specific, but instead bear a closer resemblance to those found in typically developing children (Messinger et al. However, other viewpoints stress specific biological factors related to autism, e.g.This perspective is consistent with the Research Domain Criteria (RDo C: Insel et al. The overall aim for the present study is to examine sex differences in ASD-relevant behaviors as endorsed by parents in a cohort of children between 17 and 30 months of age. Mo Ba is a prospective population-based pregnancy cohort study established by the Norwegian Institute of Public Health.Participants included pregnant mothers recruited during the years 1999–2010 at ultrasound examinations at approximately week 18 of pregnancy.In addition, from the clinical records registered in the Norwegian Patient Registry (NPR), ASD-diagnosis registered at any-time from the first 1 year of age were used.Exact age at first diagnosis and level of functioning is not available for patients retrieved from the NPR, as it only lists the diagnostic status of a given child for the specific year(s) seen by specialized services.

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