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Table 2 Mean Scores on Measures of Psychopathic Traits and Emotional Reactivity to Unpleasant Pictures by HIA-CP Group Designation

From: Revisiting Lynam's notion of the "fledgling psychopath": are HIA-CP children truly psychopathic-like?

  non-HIA-CP HIA-only CP-only HIA-CP t-values
Variable M (SD) M (SD) M (SD) M (SD) Cont. 1 Cont. 2 Cont. 3
Psychopathy (Total) 8.40 (4.49) 10.42 (4.13) 12.12 (5.30) 15.50 (6.95) 6.72*** 3.88*** 2.22
   Narcissism 2.24 (1.97) 2.30 (1.65) 3.18 (1.59) 4.20 (2.91) 4.32*** 3.37** 1.56
   Impulsivity 3.64 (1.82) 4.85 (1.68) 4.76 (1.75) 6.20 (2.19) 6.15*** 2.62* 2.39*
   Callous-Unemotional 3.00 (2.56) 3.87 (2.64) 4.27 (3.03) 5.53 (3.79) 3.88*** 2..08 1.35
Arousal to Unpleasant Pictures (IAPS) 5.66 (2.28) 4.87 (2.56) 3.88 (2.63) 4.74 (2.78) 1.95 < 1 1.28
  1. Note. Total, Narcissism, and Impulsivity score come from parental report of the Antisocial Process Screening Device (APSD). Callous-Unemotional is a composite of items from parent reports of the APSD callous-unemotional traits scale and the Strength and Difficulties Questionnaire (SDQ) prosocial behavior scale. HIA (Hyperactivity) and CP (Conduct Problems) come from teacher report on the SDQ. IAPS = International Affective Pictures System. Cont. 1 = contrast comparing mean non-HIA-CP to HIA-CP; Cont. 2 = contrast comparing mean HIA-only to HIA-CP; Cont. 3 = contrast comparing mean CP-only to HIA-CP. Type I error was maintained at α = .05 for all pairwise comparisons using Dunnett's procedure. t- values are based on 486 (APSD), 456 (Callous-Unemotional), and 599 (IAPS) degrees of freedom.
  2. * p < .05; ** p < .01; *** p < .001; 1-tailed test, p < .05.