TABLE 3.
Cohort Characteristics (n=7,103)
| Characteristic | N (%) |
|---|---|
| Sex | |
| Female | 3,474 (48.9) |
| Male | 3,629 (51.1) |
| Race/Ethnicity | |
| Black | 3,004 (42.3) |
| White | 2,847 (40.1) |
| Other Racea | 691 (9.7) |
| Missing Race | 561 (7.9) |
| Hispanic Ethnicity | 359 (5.1) |
| Maternal Education | |
| <12th grade | 91 (1.3) |
| High School/GED | 737 (10.4) |
| Some College or more | 4,330 (61.0) |
| Missing Education | 1,945 (27.4) |
| Kaiser Permanente Enrollment Duration b | |
| Enrolled through age 6 | 7,103 (100.0) |
| Enrolled through age 8 | 4,075 (57.4) |
| Year of Birth | |
| 2000 – 2001 | 2,273 (32.0) |
| 2002 – 2003 | 2,130 (30.0) |
| 2004 – 2005 | 1,482 (20.9) |
| 2006 – 2007 | 1,218 (17.1) |
a
Includes the following racial groups: Asian, American Indian, Alaska Native, Native Hawaiian or other Pacific Islander, children identifying with more than one racial group
b
Enrollment through age 6 part of inclusion criteria. Children enrolled through age 8 are a subset of children enrolled through age 6. Reduction in sample size across follow-up reflects shorter follow-up time available for children born in later years of the study (e.g., a child born in 2005 could be at most 8 years old at the time of medical record data abstraction) as well as HMO enrollment attrition over time.