Table 1.

Sample characteristics (N = 148)

		Psychopathy Group
Measure		Low (n = 48)	Intermediate (n = 53)	High (n = 47)
PCL-R Total	M (SD)	15.6 (3.3)	24.7 (2.3)	32.2 (2.2)
	Range	6.7-20.0	21.0-29.0	30.0-40.0
Age	M (SD)	25.0 (2.7)	25.9 (2.6)	25.9 (3.0)
	Range	19.4-30.0	20.9-30.0	19.4-29.9
IQ	M (SD)	96.8 (12.7)	96.5 (14.9)	98.1 (13.3)
	Range	74.0-123.0	70.9-126.0	72.0-134.0
Race/Ethnicity (White)	%	68.8%	54.7%	51.1%
Substance Use Disorder	%	81.2%	100.0%	93.6%
Head Injury	%	16.2%	32.7%	41.5%

Note: Psychopathy groups were formed according to recommended cut-offs (Hare, 2003): low (PCL-R ≤ 20), intermediate (PCL-R > 20 and < 30), and high (PCL-R ≥ 30).