This study examined the treatment sensitivity of the ADHD Questionnaire (ADHDQ),
which is a brief rating scale for measuring symptoms of inattention, hyperactivity,
and impulsivity in children. Parent, teacher, and child self-report data of
the ADHD-Q were obtained for 17 clinically referred children with ADHD on the
three occasions: (1) during the regular intake assessment, (2) just before the start
of the stimulant medication (i.e., methylphenidate) intervention, and (3) four weeks
after the start of the medication intervention. Results showed that ADHD-Q scores
remained fairly stable in the period prior to the intervention, but then showed a
substantial decline after the stimulant medication had been administered. Clearly,
this finding supports the treatment sensitivity of the ADHD-Q.