Living with Chronic Illness Scale: Validation in a Type 2 Diabetes Mellitus Population | Research Square
Jorge Caro-Bautista, Carmen Rodriguez-Blázquez, David Perez-Manchon, Eva Timonet, Gloria Carvajal, Alejandra Fuentes-Ramírez, Silvia Corchon, Marta Aranda-Gallardo, Leire Ambrosio
Carmen Rodriguez-Blázquez
Methods: In this observational, international, cross-sectional study, 582 persons with T2DM were recruited in primary health care and outpatient hospital consultations, in Spain and Colombia, during the period from May 2018 to June 2019. The properties analysed were feasibility/acceptability, internal consistency, reliability, precision and (structural) content-construct validity. The COSMIN checklist was used to assess the methodological/psychometric quality of the instrument.
Results: The instrument has adequate internal consistency and test retest reliability (Cronbach’s alpha = 0.90; intraclass correlation coefficient = 0.96, respectively). In addition, the instrument is accurate (standard error of measurement = 3.34, with values <½SD = 8.52 considered acceptable) and correlates positively with social support (DUFSS) (rs = 0.56), quality of life (WHOQOL) (rs = 0.51-0.30) and satisfaction (SLS-6) (rs = 0.50-0.38). The questionnaire discriminates by the level of severity of the illness (Patient Based Global Impression of Severity Scale), associating lower values with greater severity, and also by male gender. The COSMIN checklist is favourable for all the properties analysed, although some weaknesses are detected for content validity.