Rasch analysis of The Melbourne Assessment of Unilateral Upper Limb Function
Article first published online: 5 FEB 2014
© 2014 Mac Keith Press
Developmental Medicine & Child Neurology
Volume 56, Issue 7, pages 665–672, July 2014
How to Cite
Randall, M., Imms, C., Carey, L. M. and Pallant, J. F. (2014), Rasch analysis of The Melbourne Assessment of Unilateral Upper Limb Function. Developmental Medicine & Child Neurology, 56: 665–672. doi: 10.1111/dmcn.12391
- Issue published online: 12 JUN 2014
- Article first published online: 5 FEB 2014
- Manuscript Accepted: 16 DEC 2013
- La Trobe University
- Murdoch Childrens Research Institute
This study investigated the internal construct validity and dimensionality of the Melbourne Assessment of Unilateral Upper Limb Function (Melbourne Assessment), a widely-used measure of quality of upper limb movement, valid for children aged 2 years 6 months to 15 years with cerebral palsy.
Rasch analysis was used to assess of Melbourne Assessment raw scores for 163 children (94 males, 69 females; mean age 8y, SD 3y 5mo). Analysis was undertaken on the full scale comprising 37 scores and on groups of scores separated into four distinct movement subscales: range of movement, accuracy, dexterity, and fluency. Tests were conducted to evaluate overall model fit, item fit, suitability of the response options, unidimensionality, and differential item functioning (DIF) for sex, child age, and different raters.
The results did not support the unidimensionality of the 37-score scale. The four subscales showed adequate model fit after removal of some score items, and rescaling of others. The resulting subscales showed good internal consistency and no DIF for sex or child age.
This study provides empirical support for a revised version of the Melbourne Assessment which comprises 14 tasks and 30 movement scores grouped across four separate subscales. Further testing is required to assess the responsiveness of subscales to clinically important change.