Spinal cord independence measure, version III: Applicability to the UK spinal cord injured population

Clive A. Glass, Luigi Tesio, Malka Itzkovich, Bakul M. Soni, Pedro Silva, Munawar Mecci, Raymond Chadwick, Waghiel El Masry, Aheed Osman, Gordana Savic, Brian Gardner, Ebba Bergström, Amiram Catz

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To examine the validity, reliability and usefulness of the Spinal Cord Independence Measure for the UK spinal cord injury population. Design: Multi-centre cohort study. Setting: Four UK regional spinal cord injury centres. Subjects: Eighty-six people with spinal cord injury. Interventions: Spinal Cord Independence Measure and Functional Independence Measure on admission analysed using inferential statistics, and Rasch analysis of Spinal Cord Independence Measure. Main outcome measures: Internal consistency, inter-rater reliability, discriminant validity; Spinal Cord Independence Measure subscale match between distribution of item difficulty and patient ability measurements; reliability of patient ability measures; fit of data to Rasch model; unidimensionality of subscales; hierarchical ordering of categories within items; differential item functioning across patient groups. Results: Scale reliability (kappa coefficients range 0.491-0.835; (p<0.001)), internal consistency (Cronbach's alpha 0.770 and 0.780 for raters), and validity (Pearson correlation; p<0.01) were all significant. Spinal Cord Independence Measure subscales compatible with stringent Rasch requirements; mean infit indices high; distinct strata of abilities identified; most thresholds ordered; item hierarchy stable across clinical groups and centres. Misfit and differences in item hierarchy identified. Difficulties assessing central cord injuries highlighted. Conclusion: Conventional statistical and Rasch analyses justify the use of the Spinal Cord Independence Measure in clinical practice and research in the UK. Cross-cultural validity may be further improved.

Original languageEnglish
Pages (from-to)723-728
Number of pages6
JournalJournal of Rehabilitation Medicine
Volume41
Issue number9
DOIs
StatePublished - Sep 2009

Keywords

  • Rehabilitation
  • Spinal cord injuries
  • Statistics

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