Table 1.
Assessment data
| Questionnaire | Mean control | Mean patient | P-value t-test |
|---|---|---|---|
| (n = 26) | (n = 18) | ||
| Age | 36.96 (1.62) | 39.17 (2.41) | P2-tailed = 0.434 |
| GIT2-IQ (Groninger Intelligentie Test) | 98.77 (2.79) | 93.65 (4.00) | P2-tailed = 0.283 |
| Raven-IQ (Raven’s Standard Progressive matrices) | 115.08 (2.05) | 106.62 (5.30) | P2-tailed = 0.101 |
| Handedness | 10.08 (0.38) | 9.67 (0.83) | P2-tailed = 0.623 |
| Years of education | 11.96 (0.34) | 7.39 (0.40) | P2-tailed < 0.001 |
| Education level | 4.88 (0.54) | 2.00 (0.47) | P2-tailed < 0.001 |
| PCL-R | n/a | 32.3 (0.85) | n/a |
| F1 | n/a | 13.5 (0.62) | n/a |
| F1 | n/a | 14.9 (0.67) | n/a |
| Psychopathic Personality Inventory Total | 398.92 (7.61) | 422.39 (9.48) | P1-tailed = 0.023 |
Numbers in brackets represent standard errors of the means. T-tests were used to compare the means of the groups; P-values are based on two-tailed testing except where directed hypotheses existed. Data for the Psychopathy Checklist-Revised (PCL-R) are not available for the control group. See Supplementary Fig. 1 for the histogram of the Psychopathy Checklist-Revised scores for the patient group and Supplementary Table 2 for a list of the clinical diagnosis for each patient.