Table 2.

Item Overlap among Measures of Impulsivity

Middle Childhood: Disruptive Behavior Rating Scale (Mother Report; Barkley & Murphy, 1998)	Late Childhood: Junior Eysenck Impulsiveness Questionnaire (Mother-Child Report; Eysenck et al., 1985)	Late Adolescence: Lack of Premeditation (Child Report; Zapolski et al., 2010)
Blurts outs answers before questions have been completed	My child (I) mostly speaks before thinking things out	I tend to blurt out things without thinking
Interrupts or intrudes on others	He/She/I generally does and says things without stopping to think	I tend to stop and think before doing things (reverse coded)
Has difficulty awaiting turn	My child (I) is an impulsive person; He/She usually does things on the spur of the moment	I like to stop and think about something before I do it (reverse coded)
	He/She/I thinks that planning takes the fun out of things	I like to know what to do before I start a project (reverse coded)
	He/She/I usually thinks carefully before doing things (reverse coded)	I try to take a careful approach to things (reverse coded); I am very careful (reverse coded)