The Inventory of Functional Status-Dialysis: development and testing.
OBJECTIVE
Development and psychometric testing of the Inventory of Functional Status-Dialysis (IFS-Dialysis), which was designed to measure functional status in persons who are receiving chronic incenter hemodialysis treatment.


METHODS
Three-phase instrument development design: Phase 1--content validity assessment; Phase 2--examination of internal consistency reliability; Phase 3--examination of construct validity.


METHODS
175 chronic hemodialysis patients recruited from an urban, free-standing, outpatient dialysis center.


METHODS
Content validity was determined using Popham's average congruency proceudre. Internal consistency reliability was determined using Cronbach's alpha reliability coefficient. Construct validity was examined by bivariate correlations between the IFS-Dialysis and the Karnofsky Performance Scale (KPS), and the Medical Outcomes Study Short Form-36 Health Survey (SF-36) in a subsample of 60 patients.


RESULTS
Content validity was established at 90%. The alpha reliability coefficient for the IFS-Dialysis was 0.86. Subscale alpha coefficients ranged from 0.71-0.82. Correlation between the IFS-Dialysis and the KPS was 0.55. Correlations between the IFS-Dialysis and SF-36 subscales ranged from 0.14-0.53.


CONCLUSIONS
The IFS-Dialysis has acceptable content validity, internal consistency, and initial construct validity. Use of the IFS-Dialysis in clinical practice is appropriate.
Thomas-Hawkins
C
C
University of Pennsylvania School of Nursing, Philadelphia, USA.
Fawcett
J
J
Tulman
L
L
D000203:Activities of Daily Living; D000223:Adaptation, Psychological; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000503:physiopathology / Q000523:psychology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D016294:Models, Nursing; D009730:Nursing Assessment / Q000379:methods*; D011594:Psychometrics; D006435:Renal Dialysis / Q000009:adverse effects / Q000451:nursing / Q000523:psychology; D015203:Reproducibility of Results; D012380:Role; D011795:Surveys and Questionnaires