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Reliability and minimal detectable change of the Challenge, an advanced motor skills test for children with cerebral palsy, Danish version

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  • Kirsten Nordbye-Nielsen
  • Thomas Maribo
  • F Virginia Wright, Toronto Western Hosp, University of Toronto, University Health Network Toronto
  • ,
  • Ole Rahbek, Aalborg Psychiatric University Hospital, Aalborg, Denmark Department of Clinical Medicine, Aalborg University Hospital, Aalborg, Denmark., Department of Childrens's Orthopaedics
  • ,
  • Bjarne Møller-Madsen

PURPOSE: To translate and cross-culturally adapt the Challenge, and investigate the reliability and minimal detectable change (MDC) of the Danish Challenge in children with cerebral palsy (CP).

MATERIALS AND METHODS: A Danish version of the Challenge was created through a standardized translation process. Four physiotherapists evaluated face validity. Independently ambulatory children with CP were tested. Live performance rating was conducted by assessors independently scoring the Challenge. Video-rating was undertaken for a subset of assessments. Same day assessment test-retest reliability was estimated. The Challenge's Best Score Total was of primary interest.

RESULTS: Forty-five children (5-18 years: mean 10 years 9 months; 19 girls) in Gross Motor Function Classification System levels I and II were tested. Inter-rater reliability was excellent for live assessments (n = 45) ICC = 0.998 (95% CI 0.998-0.999) and video assessments (n = 15) ICC = 0.991 (95% CI 0.963-0.997) and intra-rater reliability was excellent for live versus video-recorded assessments (n = 10) ICC = 0.977 (95% CI 0.895-0.994). Test-retest reliability (n = 22) was excellent with ICC = 0.991 (95% CI 0.979-0.996) and minimal detectable change (MDC90) of 4.7 points.

CONCLUSIONS: The Danish Challenge showed excellent reliability in this testing context when physiotherapists scored from live- or video-recorded assessments. The Challenge's ability to detect 4.7 points change seems a clinically realistic target for progress. Clinical trial registration: This trial has been approved by the Data Protection Agency, Central Region Denmark, Ref nr.: 615216, Case nr.: 1-16-02-46-16. Registration date: 01-01-2016.Implications for rehabilitationThe Challenge remained reliable and maintained a promising minimal detectable change of less than five points after translation and cultural adaptation.The Danish version of the Challenge 20-item version can be used to measure advanced motor skill performance in children with cerebral palsy, GMFCS level I and GMFCS level II.Challenge live scoring is as reliable as the more time-consuming video-recorded scoring, meaning that physiotherapists can choose the method that fits best with their clinical context and preference.

Original languageEnglish
JournalDisability and Rehabilitation
Pages (from-to)1-8
Number of pages8
Publication statusE-pub ahead of print - 6 May 2021

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