Content Validity of the ADHD Rating Scale (ADHD RS-IV) and Adult ADHD Self-Report Scale (ASRS) in Phenylketonuria

Abstract The ADHD Rating Scale (ADHD RS-IV; parent report) and Adult ADHD Self-Rating Scale (ASRS; self-report) are validated instruments for measuring symptoms of attention-deficit/hyperactivity disorder (ADHD). The objectives of this study were to elicit descriptions of phenylketonuria (PKU) symptoms and assess content validity of these instruments in PKU. Parents (N = 15) of children with PKU (?8 years old) and adults with PKU (N=13) described PKU-related symptoms and commented on the scale’s clarity, comprehensiveness, and relevance to their experience with PKU. Most of the adults (84.6%...