Table 2. Descriptive Statistics for the Psychopathic Personality Inventory and Statistical Comparisons of Subsamples.
| Total Sample | Community Subsample | Student Subsample | Subsample Comparisons | ||||
|---|---|---|---|---|---|---|---|
| M (SD) | Min / Max | M (SD) | Min / Max | M (SD) | Min / Max | Test Statistic / P-Value | |
| PPI-CU | 0.0 (0.7) | -2.0 / 1.8 | 0.0 (0.8) | -2.0 / 1.4 | 0.0 (0.7) | -1.5 / 1.8 | t = -0.4 / .68 |
| PPI-I | 0.0 (0.9) | -2.1 / 2.5 | -0.1 (1.0) | -1.7 / 1.8 | 0.0 (0.9) | -2.1/ 2.5 | t = -0.7 / .48 |
| PPI-Coldheartedness | 0.0 (1.0) | -2.7 / 2.6 | 0.1 (1.2) | -2.7 / 2.6 | 0.0 (0.9) | -2.0 / 2.4 | t = 0.8 / .44 |
| PPI-II | 0.0 (0.9) | -2.3 / 3.1 | 0.1 (0.9) | -0.1 / 3.1 | 0.0 (0.9) | -2.3 / 1.6 | t = 0.7 / .46 |
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| PPI-Total Score | 380 (37.2) | 267 / 477 | 380 (36.5) | 329 / 470 | 380 (37.8) | 267 / 477 | t = -1.0 / .33 |
| Machiavellian Egocentricity | 70 (14.0) | 35 / 101 | 69 (10) | 56 / 98 | 70 (15.0) | 35 / 101 | t = -0.5 / .60 |
| Blame Externalization | 35 (8.5) | 19 / 62 | 33 (8.0) | 19 / 52 | 36 (8.6) | 19 / 62 | t = -1.6 / .11 |
| Carefree Nonplanfulness | 39 (8.2) | 22 / 65 | 40 (7.6) | 30 / 65 | 39 (8.4) | 22 / 61 | t = 0.7 / .52 |
| Impulsive Nonconformity | 39 (7.7) | 24 / 60 | 42 (7.5) | 28 / 58 | 38 (7.5) | 24 / 60 | t = 2.3 / .02 |
| Fearlessness | 51 (9.4) | 28 / 73 | 52 (8.8) | 34 / 66 | 51 (9.7) | 28 / 73 | t = 0.6 / .55 |
| Social Potency | 64 (12.0) | 37 / 90 | 63 (13) | 38 / 90 | 65 (12.0) | 37 / 86 | t = -0.8 / .44 |
| Stress Immunity | 32 (5.5) | 17 / 43 | 31 (6.6) | 17 / 42 | 32 (5.0) | 21 / 43 | t = -1.0 / .32 |
| Coldheartedness | 45 (8.4) | 24 / 67 | 46 (10) | 24 / 67 | 45 (7.8) | 37 / 65 | t = 0.8 / .44 |
Note. Total Sample N = 100; Community Sample n = 26; Student Sample n = 74. Statistics in bold indicate significant differences between the community and subject pool subsamples.