3.4 Levenson Self-Report Psychopathy scale
The Levenson Self-Report Psychopathy Scale (LSRP; Levenson et al., 1995) is a 26-item inventory of psychopathic traits including items capturing egocentricity, callousness, impulsivity and antisocial behavior. Item responses are recorded on a four-point Likert scale (1 = strongly disagree to 4 = strongly agree). Analyses of the psychometric properties of LSRP items have provided support for both a two-factor and a three-factor model (Brinkley et al., 2008; Sellbom, 2011). Here we use the two-factor model in light of equivocal for evidence for the convergent and discriminant validity of the Callousness factor from the three-factor model (Salekin et al., 2014). Factor 1 is measured with 16 items that capture the callous/manipulative interpersonal style that underpins primary psychopathy (Karpman, 1948). Factor 2 measures secondary psychopathy with 10 items indicating impulse control and antisocial behavior. The internal consistencies of LSRP total items (Cronbach’s alpha = 0.82) and Factor 1 items (Cronbach’s alpha = 0.80) were good. However, the internal consistency of items in Factor 2 was questionable (Cronbach’s alpha = 0.66).11Two items “Love is overrated.” and “I would be upset if my success came at someone else’s expense.” were not included in surveys distributed to 43% of the sample. Therefore, these items were omitted from the estimation of scale scores.