Table 1.
Participant characteristics
| All (n=124) | Non-Psychopathic (n=35) | Intermediate (n=48) | Psychopathic (n=41) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | pa | |
| Age | 31.6 | 7.3 | 31.3 | 7.9 | 31.8 | 6.7 | 31.5 | 7.7 | 0.93 |
| IQ | 98.1 | 11.5 | 97.3 | 12.0 | 95.3 | 11.6 | 101.5 | 10.3 | 0.19 |
| Total PCL-R score | 24.8 | 7.1 | 15.3 | 3.4 | 25.6 | 2.3 | 32.1 | 1.6 | <.001 |
| Factor 1 score | 9.2 | 3.3 | 5.5 | 2.1 | 9.3 | 2.3 | 12.3 | 1.8 | <.001 |
| Factor 2 score | 13.6 | 3.9 | 8.6 | 2.8 | 14.3 | 1.9 | 17 | 1.5 | <.001 |
| % | n | % | n | % | n | % | n | ||
| SUD: abuse | 24.2 | 30 | 22.9 | 8 | 25 | 12 | 24.4 | 10 | .88 |
| SUD: dependence | 55.6 | 69 | 40 | 14 | 56 | 27 | 68.3 | 28 | .01 |
| Race | |||||||||
| Caucasian | 56.6 | 70 | 60 | 21 | 45.8 | 22 | 65.6 | 27 | 0.52 |
| African-American | 41.1 | 51 | 34.3 | 12 | 52.1 | 25 | 34.1 | 14 | 0.52 |
| Hispanic | 1.6 | 2 | 2.9 | 1 | 2.1 | 1 | 0 | 0 | N/A |
| Native American | 0.8 | 1 | 2.9 | 1 | 0 | 0 | 0 | 0 | N/A |
Participant demographic and neuropsychological information is presented by group for non-psychopathic (PCL-R ≤20), intermediate (PCL-R >20 and <30) and psychopathic (PCL-R ≥30) inmates.
a
p-values are reported for two-sample t-tests (for age, IQ and psychopathy scores), Fisher's Exact Test (for Race) and Pearson Chi-Square test (for substance abuse and dependence) comparing psychopathic and non-psychopathic inmates.