Table 3.
Baseline demographic data in Philadelphia Healthy Brains and Behavior Study
| Demographic information (n) | Mean (standard deviation) | [Range] | Frequency (Percent of total) |
|---|---|---|---|
| Age (years) (413) | 11.46 (0.52) | 11, 13 | |
| Gender (413) | |||
| Boys | 216 (52.0%) | ||
| Girls | 197 (47.5%) | ||
| Race (413) | |||
| White/Caucasian | 45 (10.8%) | ||
| African Americans/Blacks | 338 (81.4%) | ||
| Hispanics/Latino | 4 (1.0%) | ||
| Asian/Pacific Islanders | 1 (0.2%) | ||
| Native American | 2 (0.5%) | ||
| Multiracial | 18 (4.3%) | ||
| Other | 5 (1.2%) | ||
| Parental marital status (410) | |||
| Never married | 237 (57.1%) | ||
| Married | 101 (24.3%) | ||
| Divorced | 34 (8.2%) | ||
| Separated | 30 (7.2%) | ||
| Widowed | 8 (1.9%) | ||
| Father lives with the child and mother (410) | |||
| No | 254 (61.2%) | ||
| Yes | 156 (37.6%) | ||
| Family monthly income (392) | 2949.90 (3007.44) | 0, 22000 | |
| Siblings (408) | |||
| 0 | 25 (6.0%) | ||
| 1 | 82 (19.8%) | ||
| 2 | 89 (21.4%) | ||
| 3 | 86 (20.7%) | ||
| > 3 | 126 (30.4%) | ||
| Father's education (years) (338) | 12.76 (2.13) | 4, 22 | |
| Father's occupation (352) | |||
| Unemployed | 129 (31.1%) | ||
| Mother's education (years) (407) | 13.35 (2.226) | 8, 23 | |
| Mother's occupation (441) | |||
| Unemployed | 228 (51.7%) |
Because the data collection/entries are still ongoing, the N values reported here may not be consistent across tables.