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The Inventory of Functional Status-Dialysis: development and testing
C Thomas-Hawkins1, J Fawcett, L Tulman
1University of Pennsylvania School of Nursing, Philadelphia, USA.
ANNA Journal
|January 15, 1999
Summary
The Inventory of Functional Status-Dialysis (IFS-Dialysis) is a reliable tool for measuring functional status in hemodialysis patients. Psychometric testing confirmed its validity and suitability for clinical use.
Area of Science:
- Nephrology
- Health Sciences
- Psychometrics
Background:
- Chronic hemodialysis patients require accurate functional status assessment.
- Existing tools may not adequately capture the nuances of functional status in this population.
Purpose of the Study:
- To develop and psychometrically test the Inventory of Functional Status-Dialysis (IFS-Dialysis).
- To establish the validity and reliability of the IFS-Dialysis for measuring functional status in chronic hemodialysis patients.
Main Methods:
- A three-phase instrument development design was employed.
- Content validity was assessed using Popham's average congruency procedure.
- Internal consistency reliability was determined using Cronbach's alpha, and construct validity was examined via correlations with the Karnofsky Performance Scale (KPS) and SF-36.
Main Results:
- The IFS-Dialysis demonstrated 90% content validity.
- Cronbach's alpha for the overall scale was 0.86, with subscale alphas ranging from 0.71-0.82.
- Initial construct validity was supported by correlations with the KPS (0.55) and SF-36 subscales (0.14-0.53).
Conclusions:
- The IFS-Dialysis possesses acceptable content validity, internal consistency, and construct validity.
- The IFS-Dialysis is appropriate for use in clinical practice to assess functional status in hemodialysis patients.