Suggestions for refinement of the disabilities of the arm, shoulder and hand outcome measure (DASH): A factor analysis and Rasch validation study

Franco Franchignoni, Andrea Giordano, Francesco Sartorio, Stefano Vercelli, Barbara Pascariello, Giorgio Ferriero

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Objective To perform a comprehensive psychometric analysis of Disabilities of the Arm, Shoulder and Hand (DASH) to examine its properties and provide insights for an improved version. Design Methodologic research on cross-sectional data from a convenience sample. Setting A free-standing rehabilitation center. Participants Outpatients and inpatients (N=238; 56% men; mean age, 52.2y) with upper-extremity musculoskeletal disorders. Main Outcome Measure The official Italian version of DASH was analyzed by factor (both explorative and confirmatory) and Rasch analysis for evaluating dimensionality, functioning of rating scale categories, item fit, hierarchy of item difficulties, and reliability indices. Interventions Not applicable. Results Factor analysis established the presence of 3 underlying constructs related to manual functioning (items 15, 711, 1618, 20, 21), shoulder range of motion (items 6, 1215, 19), and symptoms and consequences (items 2230). Rating scale diagnostics showed category malfunctioning. The fit to the Rasch model was good for all items except 4 (items 20, 21, 25, 26). Ten item pairs had high residual correlations after subtraction of the Rasch dimension (local dependency). A test model based on the 3 subscales suggested by factor analysis and corrected categories still showed misfitting in items 21 ("Sexual Activities") and 26 ("Tingling") and the presence of some dependent items. Conclusions Unidimensionality and the key domains identified by the original developers as the theoretic framework of DASH were not confirmed by our analyses. The response categories showed misfunctioning. "Sexual Activities" and "Tingling" misfit the Rasch model. Further detailed investigations of DASH are warranted, both to confirm these results in different health conditions and cultures, and to reanalyze in-depth content validity issues regarding the questionnaire.

Original languageEnglish
Pages (from-to)1370-1377
Number of pages8
JournalArchives of Physical Medicine and Rehabilitation
Volume91
Issue number9
DOIs
Publication statusPublished - Sep 2010

Fingerprint

Validation Studies
Statistical Factor Analysis
Arm
Hand
Outcome Assessment (Health Care)
Sexual Behavior
Rehabilitation Centers
Articular Range of Motion
Psychometrics
Upper Extremity
Inpatients
Research Design
Outpatients
Health

Keywords

  • Disability evaluation
  • Musculoskeletal diseases
  • Outcome assessment (health care)
  • Psychometrics
  • Rehabilitation

ASJC Scopus subject areas

  • Rehabilitation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Medicine(all)

Cite this

@article{257e052cf4d54619bd9e0bb67c2a8ec3,
title = "Suggestions for refinement of the disabilities of the arm, shoulder and hand outcome measure (DASH): A factor analysis and Rasch validation study",
abstract = "Objective To perform a comprehensive psychometric analysis of Disabilities of the Arm, Shoulder and Hand (DASH) to examine its properties and provide insights for an improved version. Design Methodologic research on cross-sectional data from a convenience sample. Setting A free-standing rehabilitation center. Participants Outpatients and inpatients (N=238; 56{\%} men; mean age, 52.2y) with upper-extremity musculoskeletal disorders. Main Outcome Measure The official Italian version of DASH was analyzed by factor (both explorative and confirmatory) and Rasch analysis for evaluating dimensionality, functioning of rating scale categories, item fit, hierarchy of item difficulties, and reliability indices. Interventions Not applicable. Results Factor analysis established the presence of 3 underlying constructs related to manual functioning (items 15, 711, 1618, 20, 21), shoulder range of motion (items 6, 1215, 19), and symptoms and consequences (items 2230). Rating scale diagnostics showed category malfunctioning. The fit to the Rasch model was good for all items except 4 (items 20, 21, 25, 26). Ten item pairs had high residual correlations after subtraction of the Rasch dimension (local dependency). A test model based on the 3 subscales suggested by factor analysis and corrected categories still showed misfitting in items 21 ({"}Sexual Activities{"}) and 26 ({"}Tingling{"}) and the presence of some dependent items. Conclusions Unidimensionality and the key domains identified by the original developers as the theoretic framework of DASH were not confirmed by our analyses. The response categories showed misfunctioning. {"}Sexual Activities{"} and {"}Tingling{"} misfit the Rasch model. Further detailed investigations of DASH are warranted, both to confirm these results in different health conditions and cultures, and to reanalyze in-depth content validity issues regarding the questionnaire.",
keywords = "Disability evaluation, Musculoskeletal diseases, Outcome assessment (health care), Psychometrics, Rehabilitation",
author = "Franco Franchignoni and Andrea Giordano and Francesco Sartorio and Stefano Vercelli and Barbara Pascariello and Giorgio Ferriero",
year = "2010",
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doi = "10.1016/j.apmr.2010.06.022",
language = "English",
volume = "91",
pages = "1370--1377",
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T1 - Suggestions for refinement of the disabilities of the arm, shoulder and hand outcome measure (DASH)

T2 - A factor analysis and Rasch validation study

AU - Franchignoni, Franco

AU - Giordano, Andrea

AU - Sartorio, Francesco

AU - Vercelli, Stefano

AU - Pascariello, Barbara

AU - Ferriero, Giorgio

PY - 2010/9

Y1 - 2010/9

N2 - Objective To perform a comprehensive psychometric analysis of Disabilities of the Arm, Shoulder and Hand (DASH) to examine its properties and provide insights for an improved version. Design Methodologic research on cross-sectional data from a convenience sample. Setting A free-standing rehabilitation center. Participants Outpatients and inpatients (N=238; 56% men; mean age, 52.2y) with upper-extremity musculoskeletal disorders. Main Outcome Measure The official Italian version of DASH was analyzed by factor (both explorative and confirmatory) and Rasch analysis for evaluating dimensionality, functioning of rating scale categories, item fit, hierarchy of item difficulties, and reliability indices. Interventions Not applicable. Results Factor analysis established the presence of 3 underlying constructs related to manual functioning (items 15, 711, 1618, 20, 21), shoulder range of motion (items 6, 1215, 19), and symptoms and consequences (items 2230). Rating scale diagnostics showed category malfunctioning. The fit to the Rasch model was good for all items except 4 (items 20, 21, 25, 26). Ten item pairs had high residual correlations after subtraction of the Rasch dimension (local dependency). A test model based on the 3 subscales suggested by factor analysis and corrected categories still showed misfitting in items 21 ("Sexual Activities") and 26 ("Tingling") and the presence of some dependent items. Conclusions Unidimensionality and the key domains identified by the original developers as the theoretic framework of DASH were not confirmed by our analyses. The response categories showed misfunctioning. "Sexual Activities" and "Tingling" misfit the Rasch model. Further detailed investigations of DASH are warranted, both to confirm these results in different health conditions and cultures, and to reanalyze in-depth content validity issues regarding the questionnaire.

AB - Objective To perform a comprehensive psychometric analysis of Disabilities of the Arm, Shoulder and Hand (DASH) to examine its properties and provide insights for an improved version. Design Methodologic research on cross-sectional data from a convenience sample. Setting A free-standing rehabilitation center. Participants Outpatients and inpatients (N=238; 56% men; mean age, 52.2y) with upper-extremity musculoskeletal disorders. Main Outcome Measure The official Italian version of DASH was analyzed by factor (both explorative and confirmatory) and Rasch analysis for evaluating dimensionality, functioning of rating scale categories, item fit, hierarchy of item difficulties, and reliability indices. Interventions Not applicable. Results Factor analysis established the presence of 3 underlying constructs related to manual functioning (items 15, 711, 1618, 20, 21), shoulder range of motion (items 6, 1215, 19), and symptoms and consequences (items 2230). Rating scale diagnostics showed category malfunctioning. The fit to the Rasch model was good for all items except 4 (items 20, 21, 25, 26). Ten item pairs had high residual correlations after subtraction of the Rasch dimension (local dependency). A test model based on the 3 subscales suggested by factor analysis and corrected categories still showed misfitting in items 21 ("Sexual Activities") and 26 ("Tingling") and the presence of some dependent items. Conclusions Unidimensionality and the key domains identified by the original developers as the theoretic framework of DASH were not confirmed by our analyses. The response categories showed misfunctioning. "Sexual Activities" and "Tingling" misfit the Rasch model. Further detailed investigations of DASH are warranted, both to confirm these results in different health conditions and cultures, and to reanalyze in-depth content validity issues regarding the questionnaire.

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