There is evidence that the broadening of the concept, the expansion of diagnostic criteria, the development of services, and improved awareness of the condition have played a major role in explaining this increase, although it cannot be ruled out that other factors might have also contributed to that trend.Ībstract = "This article reviews the results of 43 studies published since 1966 that provided estimates for the prevalence of pervasive developmental disorders (PDDs), including autistic disorder, As-perger disorder, PDD not otherwise specified, and childhood disin-tegrative disorder. The meaning of the increase in prevalence in recent decades is reviewed. Combined all together, recent studies that have examined the whole spectrum of PDDs have consistently provided estimates in the 60-70/10,000 range, making PDD one of the most frequent childhood neurodevelopmental disorders. Prevalence of Asperger disorder is much lower than that for autistic disorder and childhood disinte-grative disorder is a very rare disorder with a prevalence of about 2/100,000. The prevalence of autistic disorder has increased in recent surveys and current estimates of prevalence are around 20/10,000, whereas the prevalence for PDD not otherwise specified is around 30/10,000 in recent surveys. To arrange an assessment with one of our therapists please contact us by emailing or calling 03.This article reviews the results of 43 studies published since 1966 that provided estimates for the prevalence of pervasive developmental disorders (PDDs), including autistic disorder, As-perger disorder, PDD not otherwise specified, and childhood disin-tegrative disorder. Unusual response to sensory information e.g.Difficulty adapting to any changes in routines or surroundings.Difficulty during social interaction, including interacting with other people and also the environment.Problems with non-verbal communication, including body language, facial expressions and gestures.Problems with verbal communication, including expressive and receptive language.There are a wide range of symptoms which can be experienced as part of PDD, these will vary for each individual and can range from mild to severe difficulties.Ĭommon symptoms experienced byindividuals with Pervasive Developmental Disorders include: Pervasive Development Disorders are lifelong conditions, but individuals who have one will vary greatly in their abilities, behaviour and intelligence. Pervasive developmental Disorder usually occurs before three years of age, however, the cause is not yet known. Pervasive Developmental Disorder not otherwise specified (PDDNOS).There are five types of Pervasive Developmental Disorders: Pervasive Developmental Disorder (PDD) is the term used to refer to a group of disorders that are characterised by developmental delays in social and communication skills. What are Pervasive Developmental Disorders (PDD)? Physiotherapy for Pervasive Developmental Disorder.Speech and Language Therapy for Pervasive Developmental Disorder.Occupational Therapy for Pervasive Developmental Disorder.How is Pervasive Developmental Disorder Treated?.How is Pervasive Developmental Disorder Diagnosed?.