Assessing Impairment in Childhood ADHD Validation of the Parent and Teacher ADHD-FX Rating Scale in a Dual-Site Clinical Sample

Objective: The current study sought to establish psychometric properties of the ADHD-FX (a culturally sensitive measure designed to assess functional impairment related to ADHD) in a dual-site clinical sample. Method: We analyzed patient charts of 67 children (47 boys and 20 girls, ages 5 to 15 years) receiving comprehensive assessments from two university-based ADHD clinics. Results: The parent and teacher ADHD-FX rating scales demonstrated good psychometric properties via adequate reliability (Cronbach’s α > .70), convergent construct validity (significant correlations with majority of theoretically related measures), and divergent construct validity (insignificant correlations with majority of theoretically unrelated measures). Conclusion: Results extend upon previously published psychometric analyses to suggest that the ADHD-FX is a reliable and valid measure for parents and teachers to assess functional impairment related to ADHD (i.e., difficulties with academic achievement, social competence, and f...