Table 2.
Adjusted fallypride BPND values in regions of interest in high and low externalizing (EXT) trait score youth (means ± standard errors of the mean).
| Regions of interest | High EXT group (N = 27) | Low EXT group (N = 31) | Statistical test* | Partial Eta squared (partial η2) |
|---|---|---|---|---|
| Superior frontal gyrus | 0.69 ± 0.049 | 0.53 ± .047 | p = 0.032 | 0.085 |
| Middle frontal gyrus | 0.85 ± 0.050 | 0.68 ± .048 | p = 0.020 | 0.10 |
| Medial frontal gyrus | 0.79 ± 0.045 | 0.64 ± .043 | p = 0.029 | 0.088 |
| Orbitofrontal gyrus | 1.06 ± 0.050 | 0.97 ± 0.049 (N = 30; 1 outlier removed) | p = 0.24 | 0.027 |
| Hippocampus | 1.51 ± 0.054 (N = 26; 1 outlier removed) | 1.43 ± 0.053 (N = 29; 2 outliers removed) | p = 0.28 | 0.025 |
| Amygdala | 3.29 ± 0.11 (N = 26; 1 outlier removed) | 2.95 ± 0.11 (N = 30; 1 outlier removed) | p = 0.038 | 0.088 |
| Insula | 1.70 ± 0.069 (N = 26; 1 outlier removed) | 1.49 ± 0.068 (N = 29; 2 outliers removed) | p = 0.048 | 0.081 |
| Midbrain | 1.97 ± 0.073 (N = 26; 1 outlier removed) | 1.83 ± 0.070 (N = 28; 2 outliers removed/1 file unavailable) | p = 0.18 (univariate ANCOVA) | 0.038 |
Presented means are adjusted for AUDIT scores, current smoker status (yes/no), occasions of cannabis use (lifetime) and occasions of drug use (lifetime; excluding cannabis, alcohol, and cigarettes) included in the repeated-measures ANCOVA.
*Reflect pairwise comparisons (univariate ANCOVA) of interactions with group as a factor (broken down by group) in the repeated measures ANCOVAs (i.e., group × region), regardless of whether the interaction was significant or not.