The information below shows a list of types of Pervasive developmental disorders, with information as to the prevalence of each of these types. Estimates of the people affected are calculated based on the available statistic.
| Disease | Prevalence Estimate | US people estimate | Statistic Used for Calculation |
| Autism | approx 1 in 500 or 0.20% or 544,000 people in USA | 544,000 | 1 in 500 to 1 in 2,500 (NIMH); 1-in-1000 to 2-in-1000, depending on diagnostic criteria |
| Asperger syndrome | N/A | N/A | No information |
| childhood disintegrative disorder | N/A | N/A | No information |
| Rett's syndrome | approx 1 in 10,000 or 0.01% or 27,200 people in USA | 27,199 | estimated 1 per 10,000 - 22,000 females suffer from Rett syndrome, Genetics Home Reference website |
| pervasive developmental disorder not otherwise specified (PDDNOS) | N/A | N/A | No information |
For more information about types of Pervasive developmental disorders, refer to our section on types of Pervasive developmental disorders.
The medical term 'prevalence' of Pervasive developmental disorders usually refers to the estimated population of people who are managing Pervasive developmental disorders at any given time, whereas the annual diagnosis rate of new cases of Pervasive developmental disorders is called the 'incidence'. For more information on prevalence and incidence statistics, see about prevalence and incidence statistics.
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