Validation of living with chronic illness scale in a type 2 diabetes mellitus population

Background: Worldwide, type 2 diabetes mellitus (T2DM) is one of the most prevalent chronic diseases and one of those producing greatest impact on patients’ day-to-day quality of life. Our study aim is to validate the “Living with Chronic Illness Scale” for a Spanish-speaking T2DM population. Methods: In this observational, international, cross-sectional study, 582 persons with T2DM were recruited in primary 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 including confrmatory factor analysis. The COSMIN checklist was used to assess the methodological/psychometric quality of the instrument. Results: The scale had an adequate internal consistency and test retest reliability (Cronbach’s alpha=0.90; intraclass correlation coefcient=0.96, respectively). In addition, the instrument is precise (standard error of measurement=3.34, with values