Graduate Program

School Psychology

Degree Name

Specialist in School Psychology

Semester of Degree Completion


Thesis Director

Gary L. Canivez


The present study examined the distinct group differences and discriminant validity of the Adjustment Scales for Children and Adolescents (ASCA; McDermott, Marston, & Stott, 1993). Participants included 37 children in kindergarten through twelfth grade. Thirty children met DISC-IV/DSM-IV criteria for Attention Deficit Hyperactivity Disorder and 7 met DISC-IV/DSM-IV criteria for Conduct Disorder. Participants were classified based on the results of the DISC-IV parent interview administered by school psychology interns. The teacher completed the ASCA when the student was initially referred. Results of the present study provided further support for the discriminant validity of the ASCA. The results of the MANOVA and ANOVA demonstrated distinct group differences between the ADHD and CD groups. Students in the CD group had statistically significant higher scores on the SAP, SAI, OPD, and DEL syndromes as predicted. Diagnostic accuracy was further evidenced through high rates of sensitivity (true positive rate), specificity (true negative rate), positive predictive power and negative predictive power. Overall correct classification (hit) rate of 92% was achieved when differentiating ADHD from CD students.