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Development of the Early Activity Scale for Endurance for Children With Cerebral Palsy

Westcott McCoy, Sarah PT, PhD; Yocum, Allison PT, DSc, PCS; Bartlett, Doreen J. PT, PhD; Mendoza, Jessica DPT; Jeffries, Lynn PT, PhD; Chiarello, Lisa PT, PhD, PCS; Palisano, Robert J PT, ScD

doi: 10.1097/PEP.0b013e31825c16f6
Research Article

Purpose: The Early Activity Scale for Endurance (EASE) was developed as a clinically feasible measure of endurance for physical activity in young children with cerebral palsy (CP). Validity and reliability were evaluated.

Methods: Participants included 414 children with CP and 106 without CP. Parents completed the EASE, an 11-item self-report measure. For construct validity, EASE scores were compared by Gross Motor Function Classification System levels (0 assigned for children without CP), age, and gender. In subgroups, convergent validity with the 6-minute walk test and test-retest reliability with a second EASE were evaluated.

Results: EASE scores differed significantly by Gross Motor Function Classification System, but not by age or gender. The EASE correlated moderately (rs = 0.57) with the 6-minute walk test. Test-retest reliability was high, intraclass correlation (2,1) = 0.95.

Conclusion: The EASE has acceptable psychometrics for use in practice and research to estimate endurance for physical activity in young children with CP.

This study was designed to examine the reliability and validity of a new measure to evaluate endurance for activity in children with CP. The authors report acceptable psychometrics for use of the EASE in practice and research.

Department of Rehabilitation Medicine, University of Washington (Dr McCoy), Seattle, Washington; Waypoint Pediatric Therapies (Dr Yocum), Sammamish, Washington; School of Physical Therapy, Faculty of Health Sciences, University of Western Ontario (Dr Bartlett), London, Ontario, Canada; Valley Medical Center, Children's Therapy (Dr Mendoza), Renton, Washington; Department of Rehabilitation Science, University of Oklahoma Health Sciences Center (Dr Jeffries), Langston, Oklahoma; Programs in Physical Therapy and Rehabilitation Sciences, Drexel University (Drs Chiarello and Palisano), Philadelphia, Pennsylvania.

Correspondence: Sarah Westcott McCoy, PT, PhD, Department of Rehabilitation Medicine, Box 356490, University of Washington, Seattle, WA 98195 (

Grant Support: Research on this measure was supported by the Canadian Institutes of Health Research (MOP 81107) and the US Department of Education, National Institutes of Disability and Rehabilitation Research (H133G060254).

The authors declare no conflict of interest.

© 2012 Lippincott Williams & Wilkins, Inc.