Increasing Prevalence, Changes in Diagnostic Criteria, and Nutritional Risk Factors for Autism Spectrum Disorders

Table 1

Summary of prevalence estimates of AD and PDD across the world regions since the year 2000*.

Region	AD estimates			PDD estimates
	Median	Range	Number of estimates	Median	Range	Number of estimates
Europe	19	7–39	16	62	30–116	14
America	22	11–40	7	65	13–110	12
Western Pacific	12	2.8–94	12	—	—	3
Southeast Asia	—	—	1	—	—	1
Eastern Mediterranean	—	—	0	—	—	3
Africa	—	—	0	—	—	0
All	17	2.8–94	36	62	1–189	33

AD: autistic disorder.
PDD: developmental disorder.
*Adapted from Elsabbagh et al., 2012 [13].