The ADHD rating scale-IV preschool version: Factor structure, reliability, validity, and standardisation in a Danish community sample

Our findings support the reliability and validity of the ADHD RS-IV-P and a three-factor model of ADHD. However, high factor correlations and similarity in model fit suggest that more research is needed to clarify the organisation of ADHD symptoms in preschool children. Furthermore, the external validity of separate ADHD dimensions at this age should be examined.