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Rasch Analysis of the Stroke Impact Scale-16
Inga Wang1, Yi-Ching Wang2, Tzu-Yi Wu3
1Inga Wang, PhD, OTR/L, is Associate Professor, Department of Rehabilitation Sciences & Technology, University of Wisconsin-Milwaukee, Milwaukee, WI.
Summary
This study evaluated the Stroke Impact Scale-16 (SIS-16) using Rasch analysis, finding it partially supports clinical use in subacute stroke patients. Further research is needed for chronic stroke populations.
Area of Science:
- Rehabilitation Medicine
- Psychometrics
- Neurology
Background:
- Limited psychometric evidence exists for the Stroke Impact Scale-16 (SIS-16).
- Evaluating the SIS-16's psychometric properties is crucial for its reliable use in stroke research and clinical practice.
Purpose of the Study:
- To assess the psychometric properties of the SIS-16 using Rasch analysis.
- To determine the validity and clinical utility of the SIS-16 in subacute stroke patients.
Main Methods:
- Secondary data analysis of 1,010 stroke patients from the Field Administration of Stroke Therapy-Magnesium Trial database.
- Rasch analysis was employed to examine item difficulty, item fit, person-item match, separation index, person reliability, and ceiling/floor effects of the SIS-16.
Main Results:
- The item 'climb a flight of stairs' was most difficult; 'sit without losing balance' was easiest.
- Four items misfit the Rasch model, and a significant ceiling effect was observed (24.2% maximum scores).
- The SIS-16 demonstrated adequate person reliability (.89) and could differentiate patients into 4.1 strata.
Conclusions:
- The SIS-16 shows partial validity for use in subacute stroke clinical settings.
- Further investigation into the SIS-16's psychometric properties in chronic stroke patients is recommended.
- The findings partially support the SIS-16's application in both clinical and research contexts.
