TABLE 1.
Research Sample Characteristics in Relation to US CDC Surveillance Data Reported in Baio et al1
| All Study Sites N = 584 (517 families) | US CDC AA | US CDC NHW | US 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.