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Abstract: SA-PO301

Psychometric Properties of the Kidney Disease Quality of Life Short Form 36 (KDQOL-36) Scale for the Evaluation of Quality of Life in Colombian Chronic Dialysis Patients

Session Information

Category: Dialysis

  • 701 Dialysis: Hemodialysis and Frequent Dialysis

Authors

  • Valderrama Rios, Martha C., Universidad Nacional de Colombia, Bogota, Bogota, Colombia
  • Sanchez, Ricardo, Universidad Nacional de Colombia, Bogota, Bogota, Colombia
  • Sanabria, Mauricio, Baxter Renal Care Services, Deerfield, Illinois, United States
Background

Quality of life is one of the most important health outcomes during kidney failure treatment. The quality of the results obtained through PROMs depends on the psychometric properties with which the instrument quantifies the construct of interest in each population.

Objective

To establish the psychometric properties of the KDQOL-36 instrument in Colombian dialysis patients.

Methods

Scale validation study carried out in adult hemodialysis or peritoneal dialysis patients treated at Baxter Renal Care Services (BRCS) network, in Bogotá, Colombia to whom the KDQOL-36 instrument was applied. The clinimetric properties assessed were content validity, internal consistency, reliability analysis through test-retest method, applying the instrument in a second moment, 8-10 days after, criterion validity through concurrent validity, with the application of the Kidney Disease Questionnaire (KDQ) at the same time; and the sensitivity to change, applying the instrument in a second moment, after an event that could generate a change in the construct.

Results

A sample of 506 patients were included (table 1). Regarding content validity, the exploratory factor analysis confirmed an adequate adjustment of the model (figure 1). Item 28 did not obtain an adequate factorial load in any of the three domains. For internal consistency the McDonald's ω, GLB and Cronbach's alpha coefficients showed values ≥ 0.89. Adequate test-retest reliability was confirmed with a Lin's correlation-concordance coefficients ≥ 0.77 and Bland and Altman plots evidencing a high level of concordance (figure 2). Spearman correlation values significantly different from zero (> 0.50) were found between KDQOL-36 scale and the KDQ instrument domains. And adequate sensitivity to change was confirmed with a p value for Friedman test equal to 0.0000.

Conclusion

The validation of the KDQOL-36 instrument for the evaluation of quality of life in Colombian population showed it has an adequate reliability, validity, and sensitivity to change.

Funding

  • Private Foundation Support