Reliability and validity of the Dutch-language version of the Viking Speech Scale in children with cerebral palsy.

Purpose: The Viking Speech Scale is used to classify speech performance in children with cerebral palsy (CP). A Dutch-language version (VSS-NL) has recently become available. This study aimed to determine the reliability and validity of the VSS-NL and the association with motor type of CP, Gross Motor Function Classification System (GMFCS), Manual Ability Classification System (MACS) and Communication Function Classification System (CFCS).