Intraobserver Reliability and Construct Validity of the Squat Test in Children With Cerebral Palsy

Maaike M Eken, Annet J Dallmeijer, Annemieke I Buizer, Saskia Hogervorst, Kim van Hutten, Marjolein Piening, Marjolein van der Krogt, Han Houdijk

Research output: Contribution to journalArticleAcademicpeer-review


PURPOSE: This study evaluated intraobserver reliability and construct validity of the squat test to assess lower extremity strength in children with cerebral palsy (CP) and spastic diplegia.

METHODS: Children with CP performed 2 trials of the squat test and calculated the intraclass correlation coefficient to evaluate intraobserver reliability. Correlations between outcomes of hand-held dynamometry (HHD) of knee extensor strength and an 8-repetition maximum (8RM) leg press test and the squat test were calculated to evaluate construct validity.

RESULTS: Excellent intraobserver reliability was observed for the squat test. Correlations between squat test performance and HHD knee extension and 8RM leg press test demonstrated good construct validity.

CONCLUSIONS: The squat test is a reliable and valid tool to assess lower extremity strength in children with CP and spastic diplegia. The squat test is inexpensive and less time-consuming, and therefore particularly suitable for clinicians.

Original languageEnglish
Pages (from-to)399-403
Number of pages5
JournalPediatric Physical Therapy
Issue number4
Publication statusPublished - 1 Oct 2020

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