TY - JOUR

T1 - CROSS-DIAGNOSTIC SCALE-BANKING USING RASCH ANALYSIS

T2 - DEVELOPING A COMMON REFERENCE METRIC FOR GENERIC AND HEALTH CONDITION-SPECIFIC SCALES IN PEOPLE WITH RHEUMATOID ARTHRITIS AND STROKE

AU - Prodinger, Birgit

AU - Kucukdeveci, Ayse A.

AU - Kutlay, Sehim

AU - Elhan, Atilla H.

AU - Kreiner, Svend

AU - Tennant, Alan

PY - 2020

Y1 - 2020

N2 - Objectives: To develop a common reference metric of functioning, incorporating generic and health condition-specific disability instruments, and to test whether this reference metric is invariant across 2 health conditions.Design: Psychometric study using secondary data analysis. Firstly, the International Classification of Functioning, Disability and Health (ICF) Linking Rules were used to examine the concept equivalence between the World Health Organization Disability Assessment Schedule (WHODAS 2.0), Health Assessment Questionnaire (HAQ) and Functional Independence Measure (FIM (TM)). Secondly, a scale-bank was developed using a reference metric approach to test-equating, based on the Rasch measurement model.Participants: Secondary analysis was performed on data from 487 people; 61.4% with rheumatoid arthritis and 38.6% with stroke.Results: Three sub-domains of the WHODAS 2.0 and all items of the HAQ and FIM (TM) 4 motor mapped on to the ICF chapters d4 Mobility, d5 Self-care and d6 Domestic life. Test-equating of these scales resulted in good model fit, indicating that a scale bank and associated reference metric across these 3 instruments could be created.Conclusion: This study provides a transformation table to enable direct comparisons among instruments measuring physical functioning commonly used in rheumatoid arthritis (HAQ) and stroke (FIM (TM) motor scale), as well as in people with disability in general (WHODAS 2.0).

AB - Objectives: To develop a common reference metric of functioning, incorporating generic and health condition-specific disability instruments, and to test whether this reference metric is invariant across 2 health conditions.Design: Psychometric study using secondary data analysis. Firstly, the International Classification of Functioning, Disability and Health (ICF) Linking Rules were used to examine the concept equivalence between the World Health Organization Disability Assessment Schedule (WHODAS 2.0), Health Assessment Questionnaire (HAQ) and Functional Independence Measure (FIM (TM)). Secondly, a scale-bank was developed using a reference metric approach to test-equating, based on the Rasch measurement model.Participants: Secondary analysis was performed on data from 487 people; 61.4% with rheumatoid arthritis and 38.6% with stroke.Results: Three sub-domains of the WHODAS 2.0 and all items of the HAQ and FIM (TM) 4 motor mapped on to the ICF chapters d4 Mobility, d5 Self-care and d6 Domestic life. Test-equating of these scales resulted in good model fit, indicating that a scale bank and associated reference metric across these 3 instruments could be created.Conclusion: This study provides a transformation table to enable direct comparisons among instruments measuring physical functioning commonly used in rheumatoid arthritis (HAQ) and stroke (FIM (TM) motor scale), as well as in people with disability in general (WHODAS 2.0).

KW - psychometrics

KW - outcome assessment

KW - stroke

KW - rheumatoid arthritis

KW - World Health Organization Disability Assessment Schedule

KW - WHODAS 2.0

KW - Functional Independence Measure

KW - FIM (TM)

KW - Health Assessment Questionnaire

KW - HAQ

KW - FUNCTIONAL INDEPENDENCE MEASURE

KW - ASSESSMENT QUESTIONNAIRE

KW - GLOBAL BURDEN

KW - WHODAS-II

KW - DISABILITY

KW - RELIABILITY

KW - VALIDITY

KW - INFORMATION

KW - ADAPTATION

KW - ISSUES

U2 - 10.2340/16501977-2736

DO - 10.2340/16501977-2736

M3 - Journal article

C2 - 32909047

VL - 52

JO - Journal of Rehabilitation Medicine

JF - Journal of Rehabilitation Medicine

SN - 1650-1977

IS - 10

M1 - 00107

ER -