Validation of the fact-lym scale to measure quality of life in colombian patients with lymphoma

Abstract

Introduction: Instruments for measuring quality of life must be validated before being used in different cultural contexts. There is a specific scale (FACT-Lym) to assess health-related quality of life (HRQOL) in patients with lymphoma, but it has not been validated in Colombia yet. Objective: To determine the clinimetric properties of the FACT-Lym scale in Colombian patients with lymphoma. Materials and methods: A validation study of a scale was conducted based on the classical test theory. The FACT-Lym scale was administered to 301 patients diagnosed with different types of lymphomas and treated at the National Cancer Institute of Colombia, and their so-ciodemographic and clinical data were recorded. The statistical analysis included exploratory factor analysis, confirmatory factor analysis, construct validity, internal consistency, test-re-test reliability and sensitivity to change. Results: The exploratory factor analysis confirmed a two-factor structure of the scale, while the confirmatory analysis showed adequate adjustment of the model. Internal consistency was measured using the Cronbach’s alpha coefficient (>0.8 on the global scale and on each of the factors). Correlation values significantly different from zero were found between the FACT-Lym scale and the FACT-G scale domains. No significant changes were observed in any domain of the FACT-Lym scale after the completion or suspension of treatment. Conclusions: The validation of the FACT-Lym questionnaire in Colombia showed it has a consistent factorial structure and adequate reliability. However, its sensitivity to change should be verified by evaluating its performance in other patient groups. © 2020, Universidad Nacional de Colombia. All rights reserved.