Table 1

Comparisons between control and antisocial personality disorder groups on demographic, cognitive, trauma and antisocial measures

Control group (n = 69) Antisocial personality disorder group (n = 18)
% (n) Mean s.d. Range % (n) Mean s.d. Range Statistic P
Demographics
     Age, years 31.23 6.83 21–46 32.72 6.54 24–44 t = 0.82 0.41
     Social class 35.00 10.84 17–58 33.83 7.64 16–43 t = 1.0 0.32
     Ethnicity, White 56.17 (36) 33.33 (6) χ 2 = 2.95 0.11
     Gender, male 84.1 (58) 94.4 (17) χ 2 = 1.52 0.22
Cognitive
     Total IQ 99.49 15.91 66–134 98.44 12.12 78–118 t = 0.8 0.41
Trauma
     Number of head injuries 2.22 4.47 0–25 2.23 3.01 0–12 χ 2 = 0.6 0.73
     Traumatic stress 2.29 5.29 0–28 2.72 5.89 0–20 t = –0.27 0.78
Antisocial
Psychopathy Checklist–Revised
     Total scores 15.88 6.43 5–30 28.65 6.12 21–40 t = 14.8 0.0001
     Factor 1 5.32 3.52 0–16 10.05 3.56 4–16 t = 8.4 0.0001
     Factor 2 7.15 2.97 0–15 13.70 2.91 9–18 t = 9.2 0.0001
Antisocial personality disorder score 4.31 2.64 0–10 10.50 2.28 6–14 t = 12.7 0.0001
Charges 2.86 10.03 0–53 6.94 6.52 0–20 t = –1.61 0.11
Convictions 0.94 3.58 0–22 2.44 2.50 0–9 t = –1.65 0.10