Table 1.

Summary of ASD datasets

Dataset	CDDS	IDEA	ADDM
Regions covered	California	All 50 states + D.C.	Selected counties in up to 15 states, varying by report
Age of autism counts	3–83	3–21	8
Denominator used to estimate prevalence	California birth data 1931–2014	NCES public school populations K-12 (age 5–17)	U.S. Census data
ASD types included	Code 1 autism (mainly AD)	Varies by state. Some may include only AD, others some or all ASD types	All ASD types, including Asperger’s syndrome
Report years	1997–2006, annually, 2014, 2016, 2017	1991–2011, annually	2000–2012, biannually
Sponsoring agency	Calif. Department of Developmental Services	U.S. Department of Education	U.S. Centers for Disease Control and Prevention
Supplementary data files	S1	S2, S3	S4