Responsiveness of the Adult Attention-Deficit/Hyperactivity Disorder Quality of Life Scale (AAQoL)

Abstract

This study examined responsiveness of the Adult Attention-Deficit/Hyperactivity Disorder Quality of Life Scale (AAQoL), which was developed to assess health-related quality of life (HRQL) among adults with attention-deficit/hyperactivity disorder (ADHD). Adults with ADHD completed the AAQoL, Conners' Adult ADHD Rating Scale (CAARS), SF-36, and Endicott Work Productivity Scale (EWPS) at baseline and week 8 of a randomized, placebo-controlled trial of atomoxetine. Clinicians rated symptom severity and improvement (CGI-ADHD-S, CGI-ADHD-I). Responsiveness was examined through effect sizes and association with change in the measures listed previously (Spearman correlations, GLMs). Analyses included 328 patients (58.8% male; mean age = 36.9 years). All AAQoL scales reflected significant improvement from baseline to week 8 (P < 0.0001). AAQoL change scores were significantly correlated with change in the CGI-ADHD-S (r = -0.37 to -0.50), EWPS (r = -0.43 to -0.63), and CAARS (r = -0.35 to -0.62) (all P < 0.001). AAQoL change scores significantly discriminated among patients with various levels of symptom improvement. AAQoL effect sizes (-0.67 to -1.11) were larger than effect sizes for the SF-36 (0.15 to -0.39). The AAQoL was responsive to change in symptoms of ADHD, and it appears to be a useful outcome measure for treatments of ADHD in adults.