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TABLE 1

Research Sample Characteristics in Relation to US CDC Surveillance Data Reported in Baio et al

All Study Sites N = 584 (517 families)US CDC AAUS CDC NHWUS CDC All Races
Age at study enrollmenta 9.6 y 8 y 8 y 8 y 
Sex ratio 3.9 NA NA 4.0 
Median age of diagnosis, mo 48b NA NA 52 
Proportion with ID, % 35.2 44.0 22.0 31.0 
All Study Sites N = 584 (517 families)US CDC AAUS CDC NHWUS CDC All Races
Age at study enrollmenta 9.6 y 8 y 8 y 8 y 
Sex ratio 3.9 NA NA 4.0 
Median age of diagnosis, mo 48b NA NA 52 
Proportion with ID, % 35.2 44.0 22.0 31.0 

NA, not available within the CDC report.

a

Age of ascertainment for US CDC surveillance data occurs during the calendar year that the child turns 8 y.

b

Mean age of ASD diagnosis for all sites is 64.9 ± 49.6; see Table 2 for additional information.

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