Table 5.

Comparison of Data Collection Requirements for the Previous and New Case Definitions of Autism Spectrum Disorder, ADDM Network, 2014 and 2016

Data Collection Element	Surveillance Method		% Change
	Previous Method	New Method
No. of ASD cases identified	9,153	8,783	−4.0
No. of criteria for record abstraction that abstractors must identify	35	3	−91.4
No. of children whose records need to be abstracted	18,408	8,783	−52.3
No. of developmental evaluations abstracted	94,989	52,719	−44.5
No. of IQ tests abstracted	24,374	12,096	−50.4
No. of adaptive tests abstracted	37,417	23,897	−36.1
No. of autism tests abstracted	19,299	15,678	−18.8
No. of composite record reviews carried out by ADDM Network cliniciansa	23,027	0	−100.0

Abbreviations: ADDM, Autism and Developmental Disabilities Monitoring; ASD, autism spectrum disorder; IQ, intelligence quotient.

^aThe number of clinician reviews is greater than the number of children with abstracted records because the protocol required that some children’s records be reviewed multiple times. The reduction in abstracted tests and evaluations is due to the reduced number of children whose information is abstracted under the new case definition.