Table 1.

Means, Standard Deviations, and Comparison Results for Cluster Characteristics

	Primary psychopaths		Secondary psychopaths		Control participants		Criminals with psychopathic features
Variable	M	SD	M	SD	M	SD	M	SD	Comparisons at p < .05
Demographic variable
Age	28.00	5.80	24.58	5.84	24.59	6.80	22.35	4.14
Education	11.30	1.87	11.40	1.71	11.41	1.74	11.15	1.54
IQ	88.77	11.77	89.08	14.23	92.34	10.75	92.38	10.44
PCL-R	30.55	4.29	27.31	5.84	16.20	4.25	27.00	4.82
Cluster variable
Alcohol	–0.20	0.81	1.32	0.45	–0.19	0.79	–0.66	0.38	s > c, f, p
Anxiety	–0.07	0.99	0.37	0.57	0.39	0.88	–0.18	1.01	s > c
Drug	0.27	0.98	0.38	0.91	–0.47	0.88	–0.08	0.19	p, s > c
Factor 1	1.07	0.54	0.10	0.94	–1.13	0.63	0.28	0.78	p > s, c, f; s, f > c
Factor 2	0.43	0.72	0.49	0.85	–0.85	0.93	0.41	0.82	p, s, f > c
IM-P	1.57	0.71	0.01	0.69	–0.57	0.46	–0.09	0.51	p, s, f > c; p > f

Note. Only significant group comparisons are listed. p = primary psychopathic cluster; s = secondary psychopathic cluster; c = control cluster; f = inmates with psychopathic features cluster. PCL-R = Psychopathy Checklist—Revised; IM-P = Interpersonal Measure of Psychopathy.