[Structure and metric properties of a questionnaire to measure disability in mobility activities in patients with chronic obstructive pulmonary disease (DIAMO-COPD questionnaire)]. / Estructura y propiedades métricas de un cuestionario para medir discapacidad en las actividades de movilidad en pacientes con enfermedad pulmonar obstructiva crónica (cuestionario DIAMO-EPOC).

OBJECTIVE: The aim of this study was to adapt a disability questionnaire in mobility activities (DIAMO-EPOC) incorporating scales based on the conceptual framework of the International Classification of Functioning, Disability and Health, and to examine its structure, reliability and validity in a cohort of patients with COPD. METHODS: A total of 137 patients with stable COPD were recruited. Two scales of 4 items each were designed and their structure was verified by exploratory factor analysis and multitrait scaling analysis. Additionally, reliability indices (internal consistency and test-retest) were calculated. Construct validity was analysed by known groups and convergence-divergence. RESULTS: The questionnaire had 2 scales, with 4 items each, corresponding to the domains of the International Classification of Functioning, Disability and Health "change and maintain the position of the body" and "walk and move". The reliability and internal consistency of the scales were acceptable and the test-retest was excellent with an ICC of 0.86 and 0.94, respectively. The scales showed a moderate association with dyspnoea, health status and muscle strength and a different score among participants with different physical performance in the Short Physical Performance Battery. CONCLUSIONS: The 2 scales of the DIAMO-EPOC questionnaire are one-dimensional and have a solid internal consistency, test-retest stability and validity, allowing the identification of specific areas of limited mobility in patients with COPD.

Estructura y propiedades métricas de un cuestionario para medir discapacidad en las actividades de movilidad en pacientes con enfermedad pulmonar obstructiva crónica (cuestionario DIAMO-EPOC) / Structure and metric properties of a questionnaire to measure disability in mobility activities in patients with chronic obstructive pulmonary disease (DIAMO-COPD questionnaire)

OBJETIVO: El objetivo del estudio fue adaptar un cuestionario de discapacidad en actividades de movilidad (DIAMO-EPOC) incorporando escalas basadas en el marco conceptual de la Clasificación Internacional del Funcionamiento, Discapacidad y Salud, y examinar su estructura, fiabilidad y validez en una cohorte de pacientes con EPOC. MÉTODOS: Un total de 137 pacientes con EPOC estable fueron reclutados. Se diseñaron dos escalas de cuatro ítems cada una y se verificó su estructura mediante análisis factorial y de multirrasgo. Adicionalmente, se calcularon los índices de fiabilidad (consistencia interna y test-retest). La validez de constructo se analizó mediante grupos conocidos y la convergencia-divergencia. RESULTADOS: El cuestionario resultó tener 2 escalas, con 4 ítems cada una, correspondientes a los dominios de la Clasificación Internacional del Funcionamiento, Discapacidad y Salud «cambiar y mantener la posición del cuerpo» y «andar y moverse». La fiabilidad y consistencia interna de las escalas resultaron aceptables y el test-retest excelente con CCI de 0,86 y 0,94, respectivamente. Las escalas mostraron una asociación moderada con la disnea, el estado de salud y la fuerza muscular de los pacientes y una diferente puntuación entre sujetos con distinto desempeño físico en la Short Physical Performance Battery. CONCLUSIONES: Las dos escalas del cuestionario DIAMO-EPOC son unidimensionales y tienen una sólida consistencia interna, estabilidad test-retest y validez, permitiendo identificar áreas específicas de movilidad limitada en pacientes con EPOC

OBJECTIVE: The aim of this study was to adapt a disability questionnaire in mobility activities (DIAMO-EPOC) incorporating scales based on the conceptual framework of the International Classification of Functioning, Disability and Health, and to examine its structure, reliability and validity in a cohort of patients with COPD. METHODS: A total of 137 patients with stable COPD were recruited. Two scales of 4 items each were designed and their structure was verified by exploratory factor analysis and multitrait scaling analysis. Additionally, reliability indices (internal consistency and test-retest) were calculated. Construct validity was analysed by known groups and convergence-divergence. RESULTS: The questionnaire had 2 scales, with 4 items each, corresponding to the domains of the International Classification of Functioning, Disability and Health "change and maintain the position of the body" and "walk and move". The reliability and internal consistency of the scales were acceptable and the test-retest was excellent with an ICC of 0.86 and 0.94, respectively. The scales showed a moderate association with dyspnoea, health status and muscle strength and a different score among participants with different physical performance in the Short Physical Performance Battery. CONCLUSIONS: The 2 scales of the DIAMO-EPOC questionnaire are one-dimensional and have a solid internal consistency, test-retest stability and validity, allowing the identification of specific areas of limited mobility in patients with COPD