TABLE 1.
Demographic variables for the full sample and comparisons by data collection site
| Full sample (n = 243) | Site 1 (UNMC 1) (n = 135) | Site 2 (MRN) (n = 108) | Comparison | |||||
|---|---|---|---|---|---|---|---|---|
| Variable | n | % | n | % | n | % | χ 2 | p |
| Sex, male | 120 | 49.38 | 63 | 47.70 | 57 | 52.78 | 0.61 | .44 |
| Race | 9.89 | .08 | ||||||
| AI/AN | 7 | 2.90 | 1 | 0.70 | 6 | 5.60 | ||
| Asian | 1 | .40 | 1 | 0.70 | 0 | 0 | ||
| B/AA | 7 | 2.90 | 5 | 3.70 | 2 | 1.90 | ||
| White | 197 | 81.10 | 106 | 78.5 | 91 | 84.30 | ||
| More than 1 race | 18 | 7.40 | 12 | 8.90 | 6 | 5.60 | ||
| Not reported | 13 | 5.30 | 10 | 7.40 | 3 | 2.80 | ||
| Ethnicity | 25.22 | <.01 | ||||||
| Latinx | 54 | 22.20 | 14 | 10.40 | 40 | 37.00 | ||
| Not Latinx | 184 | 75.70 | 117 | 86.70 | 67 | 62.00 | ||
| Not reported | 5 | 2.10 | 4 | 3.0 | 1 | 0.90 | ||
| Mean (SD) | Range | Mean (SD) | Range | Mean (SD) | Range | t | p | |
|---|---|---|---|---|---|---|---|---|
| Age T1 | 11.73 (1.78) | 9–15 | 11.70 (1.69) | 9–15 | 11.76 (1.88) | 9–15 | 0.24 | .81 |
| Age T2 | 12.96 (1.81) | 10–17 | 12.88 (1.69) | 9–15 | 13.04 (1.95) | 10–17 | 0.71 | .48 |
| Age T3 | 13.86 (1.75) | 11–17 | 13.96 (1.93) | 11–17 | 13.79 (1.61) | 11–16 | 0.63 | .53 |
| Stress T1 | 23.15 (7.98) | 11–62 | 23.07 (7.89) | 11–62 | 23.28 (8.18) | 12–56 | 0.50 | .62 |
| Threat T1 | 0.93 (1.24) | 0–6 | 1.10 (1.32) | 0–5 | 0.79 (1.16) | 0–6 | 1.43 | .15 |
| L Amygdala T2 | 1576.29 (329.17) | 410.40–3307.00 | 1628.26 (395.10) | 426.40–3307.00 | 1536.20 (263.63) | 410.40–2025.90 | 0.28 | .78 |
| R Amygdala T2 | 1575.73 (355.11) | 216.20–3056.40 | 1588.34 (393.48) | 216.20–3056.40 | 1566.00 (325.04) | 289.70–2190.30 | 0.31 | .76 |
| L Hippocampus T2 | 4288.71 (586.77) | 1839.90–7732.90 | 4245.07 (722.36) | 1839.90–7732.90 | 4322.38 (458.58) | 3185.90–5806.50 | 2.88 | < .01 |
| R Hippocampus T2 | 4318.11 (605.38) | 1917.30–8064.00 | 4289.58 (743.61) | 1917.30–8064.00 | 4340.13 (476.91) | 2630.00–5487.00 | 1.11 | .27 |
| Internalizing T3 | 5.02 (5.57) | 0–29 | 4.67 (5.41) | 0–28 | 5.43 (5.77) | 0–29 | 0.78 | .44 |
| Externalizing T3 | 3.48 (4.24) | 0–21 | 3.25 (3.79) | 0–14 | 3.75 (4.73) | 0–21 | 0.67 | .50 |
| Dysregulation T3 | 6.63 (6.26) | 0–28 | 6.33 (6.23) | 0–28 | 6.97 (6.32) | 0–28 | 0.57 | .57 |
Note: Brain measures are reported in volume mm3. Age at each timepoint is reported in years. Internalizing, externalizing, and dysregulation are all raw scores from the Child Behavior Checklist. To evaluate potential study site effects, χ 2 analyses were conducted for binary variables and independent samples t‐tests were conducted for continuous variables.
Abbreviations: AI/AN, American Indian/Alaska Native; B/AA, Black, African American; L, left; R, right; T, time.