Table 1.
ABCD Single Birth Expected Demographic Targets for the Nation and by U.S. Census Region.
| Census Region of ABCD Study Site | Total Study Sites | Single Birth Baseline Cohortc | Race/Ethnicity of Childa |
Rural School Students | ||||
|---|---|---|---|---|---|---|---|---|
| White | African-American | Hispanic | Asian | All Otherb | ||||
| Northeast | 4 | 1900 | 1252 | 315 | 207 | 68 | 58 | 358 |
| Midwest | 4 | 1385 | 795 | 321 | 124 | 94 | 49 | 210 |
| South | 6 | 2710 | 1114 | 694 | 596 | 85 | 221 | 310 |
| West | 7 | 3520 | 1546 | 251 | 1284 | 257 | 195 | 320 |
| Total ABCD Baseline | 21 | 9515 | 4707 | 1581 | 2211 | 504 | 512 | 1198 |
| % of ABCD Single Birth Total in Target Sample | NA | 100.0% | 49.5% | 16.6% | 23.2% | 5.3% | 5.4% | 12.3% |
| %Total ABCD 21 Site Age 9–10 Children in Public and Private Schools | NA | 100.0% | 51.3% | 14.9% | 23.4% | 5.6% | 4.9% | 12.3% |
| %Total U.S. Population Age 9–10 Children in Public and Private Schools | NA | 100.0% | 50.7% | 14.5% | 25.1% | 5.0% | 4.7% | 17.5% |
a
Assumes a 50:50 female to male allocation for each race/ethnicity category.
b
Includes children of Native Hawaiian, Pacific Islander, Alaskan Native, American Indian and multiple races.
c
An additional 265 subjects, which will bring the single birth total to 9780, are not yet allocated. Their allocation will be made to ensure that the final sample matches the target demographics.