[Auditory processing disorder versus attention deficit/hyperactivity disorder. A dysfunction complex or different entities?].

Background It has been suggested that auditory processing disorders (APD) and attention deficit/hyperactivity disorders (ADHD) may be the same entity with slightly differing symptoms. For testing this theory we compared parents' ratings of APD and ADHD behavioural characteristics. Methods A retrospective study was carried out with parents rating 312 children (113 girls and 199 boys; 6.0-9.11 years old, nonverbal intelligence IQ 95 or above) using APD and ADHD questionnaires. Results Significant, albeit weak correlations between several APD and ADHD subscale scores were found. Correlations between selective listening and attention behaviours approximated clinical relevance (rho >0.4). Factor analysis revealed two factors with APD behaviour loading on one and ADHD behaviour on a second different factor. Using a categorical approach, it appears that ADHD children have significantly more APD problems than children without ADHD. Discussion These data are consistent with the hypothesis that APD and ADHD overlap partly while still being distinct entities. In addition to dimensional aspects, the parents' rating may provide a guideline for establishing a diagnosis based on categorical distinctions.