Psychometric properties of the Chilean version of the quality of life questionnaire for multiple myeloma.

OBJECTIVES: To evaluate the internal consistency and construct validity of the QLQ-MY20 for assessing the quality of life in multiple myeloma survivors in Chile. METHODS: This was a cross-sectional study conducted between March 2020 and December 2022. It involved 118 individuals from two public hospitals. The QLQ-C30 and QLQ-MY20 questionnaires were used. Internal consistency was assessed using Cronbach's alpha(α), and construct validity was evaluated through hypothesis testing (Mann-Whitney and Spearman correlation). RESULTS: The average age of participants was 67.2 years (SD=9.2). Internal consistency for the complete scale was α=0.779, for the "disease symptoms" dimension α=0.671, for the "side effects of treatments" dimension α=0.538, and for the "future perspective" dimension α=0.670. Four of the five construct validity hypotheses were confirmed: women, individuals with worse performance status, those with pain, and those with worse fatigue showed more symptoms. CONCLUSIONS: The Chilean version of the QLQ-MY20 demonstrates adequate internal consistency and construct validity.

Psychometric properties of the Chilean version of the quality of life questionnaire for multiple myeloma / Propriedades psicométricas da versão chilena do questionário de qualidade de vida para mieloma múltiplo / Propiedades psicométricas de la versión chilena del cuestionario de calidad de vida para mieloma múltiple

ABSTRACT Objectives: To evaluate the internal consistency and construct validity of the QLQ-MY20 for assessing the quality of life in multiple myeloma survivors in Chile. Methods: This was a cross-sectional study conducted between March 2020 and December 2022. It involved 118 individuals from two public hospitals. The QLQ-C30 and QLQ-MY20 questionnaires were used. Internal consistency was assessed using Cronbach's alpha(α), and construct validity was evaluated through hypothesis testing (Mann-Whitney and Spearman correlation). Results: The average age of participants was 67.2 years (SD=9.2). Internal consistency for the complete scale was α=0.779, for the "disease symptoms" dimension α=0.671, for the "side effects of treatments" dimension α=0.538, and for the "future perspective" dimension α=0.670. Four of the five construct validity hypotheses were confirmed: women, individuals with worse performance status, those with pain, and those with worse fatigue showed more symptoms. Conclusions: The Chilean version of the QLQ-MY20 demonstrates adequate internal consistency and construct validity.

RESUMO Objetivos: Avaliar consistência interna e validade de construto do QLQ-MY20 para avaliação da qualidade de vida em sobreviventes de mieloma múltiplo no Chile. Métodos: Estudo transversal, realizado entre março de 2020 e dezembro de 2022. Participaram 118 pessoas de dois hospitais públicos. Foram utilizados questionários QLQ-C30 e QLQ-MY20. A consistência interna foi avaliada com alfa de Cronbach(α) e a validade de construto através de testes de hipóteses (Mann Whitney e correlação de Spearman). Resultados: A idade média dos participantes era de 67,2 (DP=9,2) anos. Consistência interna para escala completa (α=0,779), dimensão "sintomas da doença" (α=0,671), dimensão "efeitos colaterais dos tratamentos" (α=0,538) e dimensão "perspectiva de futuro" (α=0,670). Quatro das cinco hipóteses de validade de construto foram confirmadas: as mulheres apresentaram mais sintomas, assim como pessoas com pior estado de desempenho, com dor e com maior fadiga. Conclusões: A versão chilena do QLQ-MY20 apresenta consistência interna adequada e validade de construto.

RESUMEN Objetivos: Evaluar consistencia interna y validez de constructo del QLQ-MY20 para valoración de calidad de vida en sobrevivientes de mieloma múltiple en Chile. Métodos: Estudio transversal, realizado entre marzo 2020 y diciembre 2022. Participaron 118 personas de dos hospitales públicos. Se utilizaron los cuestionarios QLQ-C30 y QLQ-MY20. Fueron evaluadas la consistencia interna con alfa de Cronbach (α) y validez de constructo mediante pruebas de hipótesis (Mann Whitney y correlación de Spearman). Resultados: El promedio de edad de los participantes era 67,2 (DE=9,2) años. Consistencia interna para escala completa (α=0,779), dimensión "síntomas de la enfermedad" (α=0,671), dimensión "efectos secundarios de los tratamientos" (α=0,538) y dimensión "perspectiva de futuro" (α=0,670). Se comprobaron cuatro de las cinco hipótesis de la validez de constructo: presentaron más síntomas las mujeres, personas con peor performance estatus, con dolor y con peor fatiga. Conclusiones: La versión chilena del QLQ-MY20 presenta adecuada consistencia interna y validez de constructo.