Table 2.
Descriptive statistics and independent samples t-tests for variables.
| All Participants |
PCL:YV Lower Quartile |
PCL:YV Highest Quartile |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (N = 100) |
(N = 22) |
(N = 21) |
||||||||||
| Variable | N | Mean | SD | N | Mean | SD | N | Mean | SD | t | df | p |
| PCL:YV Total | 100 | 23.82 | 6.46 | 22 | 14.64 | 3.53 | 21 | 32.03 | 1.47 | −20.93 | 41 | < .001 |
| PCL:YV Factor 1 | 100 | 6.75 | 3.19 | 22 | 3.45 | 2.11 | 21 | 11.05 | 1.36 | −13.96 | 41 | < .001 |
| PCL:YV Factor 2 | 100 | 12.78 | 3.20 | 22 | 8.36 | 2.74 | 21 | 15.86 | 1.49 | −11.08 | 41 | < .001 |
| PCL:YV Facet 1 | 100 | 2.24 | 1.91 | 22 | 1.09 | 1.60 | 21 | 4.76 | 1.14 | −8.63 | 41 | < .001 |
| PCL:YV Facet 2 | 100 | 4.51 | 1.87 | 22 | 2.36 | 1.33 | 21 | 6.29 | 1.10 | −10.51 | 41 | < .001 |
| PCL:YV Facet 3 | 100 | 6.52 | 2.02 | 22 | 3.91 | 1.54 | 21 | 8.19 | 1.17 | −10.24 | 41 | < .001 |
| PCL:YV Facet 4 | 100 | 8.18 | 1.81 | 22 | 6.09 | 2.05 | 21 | 9.67 | 0.66 | −7.64 | 41 | < .001 |
| Age | 100 | 17.38 | 0.86 | 22 | 17.36 | 0.85 | 21 | 17.62 | 0.81 | −1.01 | 41 | .317 |
| IQ | 91 | 93.90 | 10.97 | 18 | 95.06 | 12.98 | 19 | 94.63 | 9.60 | 0.13 | 35 | .910 |
| Substance Use | 100 | 2.33 | 1.67 | 22 | 1.55 | 1.14 | 21 | 2.67 | 1.93 | −2.33 | 41 | .025 |
| ERN/Ne | 100 | −3.17 | 4.39 | 22 | −3.69 | 4.96 | 21 | −3.08 | 3.57 | −0.46 | 41 | .649 |
| Pe | 100 | 6.25 | 6.78 | 22 | 8.61 | 7.05 | 21 | 4.84 | 7.37 | 1.72 | 41 | .093 |
| PC1 | 100 | 0.31 | 0.41 | 22 | 0.37 | 0.48 | 21 | 0.30 | 0.38 | 0.55 | 41 | .586 |
| PC2 | 100 | 0.64 | 0.50 | 22 | 0.87 | 0.50 | 21 | 0.50 | 0.51 | 2.40 | 41 | .021 |
| PC3 | 100 | −0.13 | 0.21 | 22 | −0.17 | 0.21 | 21 | −0.10 | 0.17 | −1.11 | 41 | .273 |
| PC4 | 100 | 0.37 | 0.42 | 22 | 0.52 | 0.48 | 21 | 0.29 | 0.38 | 1.67 | 41 | .102 |
Note. Assessments: PCL:YV Total is the total score derived from the Psychopathy Checklist: Youth Version (PCL:YV); PCL:YV Factor 1 and 2 are Factor 1 and 2 scores derived from the PCL:YV; PCL:YV Facet 1, Facet 2, Facet 3, and Facet 4 scores are Facet 1, 2, 3, and 4 scores derived from the PCL:YV (Forth et al., 2003); Intelligence Quotient (IQ) was calculated from the Wechsler Adult Intelligence Scale–Third Version (WAIS-III) (Wechsler, 1997); Substance Use is the number of substance dependencies calculated by summing the total number of substances (alcohol and drug) for which participants met lifetime dependence diagnoses from the Kiddie Schedule for Affective Disorders and Schizophrenia (K-SADS) (Kaufman et al., 1997); ERN/Ne, Pe, PC1, PC2, PC3, and PC4 refer to the mean amplitude of the time-domain and principal components pertaining to ERN/Ne and Pe amplitude.