Individuals with autism spectrum disorder (ASD) have higher rates of co-occurring diagnoses and use of psychotropic medication prescriptions than people with other developmental disabilities. Few studies have examined these trends in samples of people with intellectual and developmental disabilities (IDD) with and without ASD. Using a random…

Change over time in the age and number of children registered for autism-specific funding was examined, prior to and following introduction of the revised diagnostic criteria (the Diagnostic and Statistical Manual of Mental Disorders-fifth edition; DSM-5). De-identified data for 32,199 children aged under 7 years between 2010 and 2015 was…

Race-specific time trends in Autism Spectrum Disorder prevalence are tracked among 3-5 year-olds and 8 year-olds identified by the U.S. Individuals with Disabilities Education Act (IDEA) and the Autism and Developmental Disabilities Monitoring (ADDM) Network, respectively. White ASD prevalence historically has been higher than other racial groups…

This study investigated time trends and associated factors of incidence rates of diagnosed autism spectrum disorders (ASD) across the lifespan from 1995 to 2010, using data from the Danish Psychiatric Central Research Registry. First time diagnosis of childhood autism, atypical autism, Asperger's syndrome, or pervasive developmental…

Reports indicate sharp increase in prevalence of autism spectrum disorders (ASD). We aimed to assess the time trend in prevalence of ASD in Israel and describe demographic characteristics of the registered cases. We reviewed the autism registry of the Israeli Ministry of Social Affairs which includes 4,709 cases and identified 4,138 cases born…

We analyzed predictors of parent-reported initial diagnosis (autistic disorder [AD], pervasive developmental disorder-not otherwise specified [PDD-NOS], pervasive developmental disorder ["PDD"] and autism spectrum disorder ["ASD"], and Asperger syndrome [AS]), among 6,176 individuals with autism spectrum disorders diagnosed from 1994 through 2007.…

This article reviews 32 epidemiological studies of pervasive developmental disorders (PDDs) published between 1966-2001. The design and sample characteristics of the surveys are described. Surveys have suggested that the rate for all forms of PDDs are around 30/10,000, but more recent surveys suggest it might be as high as 60/10,000. (Contains…

Comparison of data on all children referred for suspected autism spectrum disorder (ASD) in the Australian Capital Territory in 1997 and 1989 found a 200% increase in ASD diagnoses in 1997 despite a population decrease; a wider age range in 1997; a 26% increase in milder cases; and a decrease in the ratio of boys to girls. (Contains references.)…

Assessment of 21 males (ages 4-27) with fragile X syndrome found that subject's age was associated with age-equivalent levels of both simultaneous processing and achievement, but not with levels of sequential processing. A smaller longitudinal study confirmed the presence of a plateau in sequential processing after the age of 10 years. (Author/JDD)