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Participant demographic information.
| Gender | Male (n) |
110 |
|---|---|---|
| Female (n) | 105 | |
| Racial background | Caucasian (n) | 156 |
| African American (n) | 20 | |
| Asian (n) | 6 | |
| Mixed race (n) | 33 | |
| Mean age (days) | 1051 ± 517 | |
| Age range (days) | 363 - 2198 | |
| Mean gestation (weeks) | 39 ± 3.2 | |
| Mean birth weight (lbs) | 7.6 ± 1.2 | |
| Mean maternal SES | 5.6 ± 1.7 |
