Table 3.
Revised Psychopathy Checklist (PCL-R) mean-score comparisons listed separately between recidivists versus non-recidivists, MAOA genotype subgroups, and psychopaths versus non-psychopaths. The sample comprised 167 alcoholic violent offenders exhibiting PCL-R total 23.5 (S.D.=7.4), factor 1 (F1) 8.8 (3.6), and factor 2 (F2) 12.0 (4.0) grand mean scores.
| Mean (S.D.)
|
F | d.f. | P-value | ||
|---|---|---|---|---|---|
| Recidivists | Non-recidivists | ||||
| Total | 25.5 (6.4) | 22.2 (7.8) | 8.4 | 1 | 0.004 |
| F1 | 8.9 (3.2) | 8.8 (3.9) | 0.01 | 1 | 0.920 |
| F2 | 13.6 (3.7) | 10.9 (3.9) | 19.3 | 1 | 0.0004 |
| MAOA-H | MAOA-L | ||||
|
| |||||
| Total | 23.3 (7.0) | 23.7 (8.0) | 0.10 | 1 | 0.745 |
| F1 | 8.4 (3.4) | 9.2 (3.9) | 2.0 | 1 | 0.156 |
| F2 | 12.3 (3.9) | 11.6 (4.2) | 1.2 | 1 | 0.269 |
| Psychopaths | Non-psychopaths | ||||
|
| |||||
| Total | 32.4 (2.4) | 20.4 (5.9) | 169.4 | 1 | 0.0004 |
| F1 | 12.7 (2.0) | 7.5 (3.1) | 105.7 | 1 | 0.0004 |
| F2 | 15.7 (2.0) | 10.7 (3.8) | 67.6 | 1 | 0.0004 |
MAOA-H = high-activity genotype, MAOA-L = low-activity genotype. Psychopathy = PCL-R≥30.