CU traits were measured using a 6-item questionnaire completed by mothers (26). Items were rated on a 3-point scale ranging from ‘not true’ to ‘certainly true’ (α = .79). These included: (i) Makes a good impression at first but people tend to see through him/her after they get to know him/her, (ii) Shallow or fast-changing emotions; (iii) Is usually genuinely sorry if s/he has hurt someone or acted badly (R); (iv) Can seem cold-blooded or callous; (v) Keeps promises (R); and (vi) Genuine in his/her expression of emotions (R). This measure has been shown to correlate highly with the CU scale of the Antisocial Process Screening Device (27).
