This study used the correlated trait–correlated method minus one model to examine the convergent and discriminant validity of the scales of the Conners 3 Short [C 3 (S)]. The C 3 (S) scales in the analysis were inattention (IN), hyperactivity/impulsivity (HY), learning problems (LP; learning problems/executive functioning from the teacher version), aggression (AG), and peer relations (PR, only for parent and teacher versions). A total of 529 adolescents and children (75% males, mean age = 11.75 years, SD = 2.97 years) provided self-ratings, and were also rated by their mothers and teachers. The findings indicated no support for the convergence of IN and HY across the three respondents. In contrast, there was convergence for LP, AG, and PR. There was support for the discriminant validity of the traits, except between IN and HY. The findings are discussed in relation to the convergent and discriminant validity of the C 3 (S) measures, and the clinical use of the C 3 (S).
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