Table 1.
Demographic Characteristics for samplea.
| Variable | Mean (or %) | SD |
|---|---|---|
| Age (years) | 9.93 | 0.007 |
| Sex (female) | 49.2 | 0.005 |
| Ethnicity (%) | ||
| Caucasian | 54.2 | 0.005 |
| African American | 12.8 | 0.007 |
| Hispanic | 12.8 | 0.013 |
| Asian | 2.1 | 0.006 |
| Other | 10.4 | 0.016 |
| Financial adversity (n = 8891) | 0.43 | 0.011 |
| Average motionb | 0.32 | 0.003 |
| Scanner type | ||
| Siemens | 63.0 | 0.005 |
| GE | 24.6 | 0.005 |
| Philips | 12.1 | 0.003 |
| Positive social behavior and experience indices | ||
| Prosocial behavior (n = 8971) | 1.76 | 0.004 |
| Number of activities in the past 12 months (n = 8986) | 3.58 | 0.025 |
| Number of Close Friends (n = 7167) | 5.96 | 0.07 |
| Negative Social Behavior and Experience Indices | ||
| Experience of Being Bullied (n = 8982) | 1.86 | 0.004 |
| Overt aggression (n = 4832) | 3.29 | 0.013 |
| Overt victimization (n = 4832) | 3.64 | 0.019 |
| Reciprocal Social Impairments (n = 8505) | 14.22 | 0.043 |
| Social problems (n = 8980) | 1.53 | 0.023 |
| Experiences of discrimination (n = 8297) | 1.17 | 0.004 |
SD standard deviation, GE general electric.
aModels were performed with available data; see each index for sample size included in models.
bAverage motion is calculated as average framewise displacement.