Table 1.
Group characteristics (mean, standard deviation) of the group of psychopathic criminals (PP) and healthy matched control subjects scoring high on the PPI_IA factor (HChigh) and healthy matched controls scoring low on the PPI_IA factor (HClow)
| PP (n = 14) | HClow (n = 10) (<146 on PPI_IA) | HChigh (n = 10) (>146 on PPI_IA) | Statistics (P-value) | |
|---|---|---|---|---|
| Age | 40.1 (8.8) | 42.5 (10.22) | 39.1 (9.7) | 0.715 |
| IQ (NLV) | 100.1 (11.0) | 101.30 (10.60) | 103.1 (5.4) | 0.733 |
| PCL-R total | 30.6 (3.8) | — | — | — |
| PCL-R Factor 1 | 11.9 (2.8) | — | — | — |
| PCL-R Factor 2 | 13.9 (2.0) | — | — | — |
| PPI total | 362.2 (42.5) | 323.7 (29.8) | 368.3 (20.8) | 0.01 |
| PPI_FD (factor 1) | 142.6 (19.9) | 133.5 (23.7) | 145.6 (14.6) | 0.366 |
| PPI_IA (factor 2) | 165.1 (28.4) | 132.8 (9.7) | 169.2 (14.7) | 0.001 |
NLV, Dutch reading test; PCL-R. Psychopathy checklist revised; PP, psychopathy group; PPI_FD, factor 1 of the PPI ‘fearless dominance’; PPI_IA, factor 2 of the PPI ‘impulsive antisociality.