Objective To derive the first systematically calculated estimate of the relative proportion of
boys and girls with autism spectrum disorder (ASD) through a meta-analysis of prevalence …

Background Autism spectrum disorder (ASD) is one of the serious developmental disorders
that is usually diagnosed below the age of three years. Although the severity of the disease's …

We provide a systematic review of epidemiological surveys of autistic disorder and
pervasive developmental disorders (PDDs) worldwide. A secondary aim was to consider the …

Autism spectrum disorder (ASD) is one the most disabling developmental disorders,
imposing an extremely high economic burden. Obtaining as accurate prevalence estimates …

There has been an increased prevalence of the diagnosis of Autism Spectrum Disorder
(ASD) globally during the last decade. An updated and overall estimate of ASD prevalence …

Background Genetic and environmental factors are both responsible for the etiology of
autism spectrum disorders (ASD). Although epidemiological studies have been conducted to …

Low vitamin D status in early development has been hypothesised as an environmental risk
factor for Autism Spectrum Disorder (ASD), given the concurrent increase in the prevalence …

Despite housing∼ 18% of the world's population, India does not yet have an estimate of
prevalence of autism. This study was carried out to estimate the prevalence of autism in a …

Most research into Autism Spectrum Disorders has been conducted in affluent English‐
speaking countries which have extensive professional support services. This paper …

Suitable screening instruments for the early diagnosis of autism are not readily available for
use with preschoolers in non-Western countries. This study evaluated two tools: M-CHAT …