Jorge Caro-Bautista1, Carmen Rodríguez-Blázquez2, David Perez-Manchon3, Eva Timonet-Andreu4, Gloria Carvajal-Carrascal5, Alejandra Fuentes-Ramírez5, Silvia Corchon6, Marta Aranda-Gallardo7, Leire Ambrosio8. 1. Andalusian Public Health System, District of Primary Health Care of Málaga-Valle del Guadalhorce and Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain. 2. National Centre of Epidemiology and CIBERNED, Carlos III Institute of Health, Madrid, Spain. 3. Faculty of Health, Camilo José Cela University, Madrid, Spain. 4. Department of Cardiology, Costa del Sol Hospital and Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain. 5. Facultad de Enfermería y Rehabilitación, Universidad de La Sabana, Chía, Colombia. 6. Faculty of Nursing and Chiropody, University of Valencia, Valencia, Spain. 7. Department of Internal Medicine, Costa del Sol Hospital, Marbella, Málaga, Spain. 8. School of Health Sciences, NIHR ARC Wessex, University of Southampton, Building 67, University Road, SO171BJ, Southampton, United Kingdom. lag1v19@soton.ac.uk.
Abstract
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 confirmatory 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 coefficient = 0.96, respectively). In addition, the instrument is precise (standard error of measurement = 3.34, with values < ½SD = 8.52) and correlates positively with social support (DUFSS) (rs = 0.56), quality of life (WHOQOL-BREF) (rs = 0.51-0.30) and ssatisfaction with life (SLS-6) (rs = 0.50-0.38). The original 26-items version of the scale did not support totally the confirmatory factor analysis. The COSMIN checklist is favourable for all the properties analysed, although weaknesses are detected for structural validity. CONCLUSIONS: The LW-CI-T2DM is a valid, reliable and accurate instrument for use in clinical practice to determine how a person's life is affected by the presence of diabetes. This instrument correlates well with the associated constructs of social support, quality of life and satisfaction. Additional research is needed to determine how well the questionnaire structure performs when robust factor analysis methods are applied.
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 confirmatory 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 coefficient = 0.96, respectively). In addition, the instrument is precise (standard error of measurement = 3.34, with values < ½SD = 8.52) and correlates positively with social support (DUFSS) (rs = 0.56), quality of life (WHOQOL-BREF) (rs = 0.51-0.30) and ssatisfaction with life (SLS-6) (rs = 0.50-0.38). The original 26-items version of the scale did not support totally the confirmatory factor analysis. The COSMIN checklist is favourable for all the properties analysed, although weaknesses are detected for structural validity. CONCLUSIONS: The LW-CI-T2DM is a valid, reliable and accurate instrument for use in clinical practice to determine how a person's life is affected by the presence of diabetes. This instrument correlates well with the associated constructs of social support, quality of life and satisfaction. Additional research is needed to determine how well the questionnaire structure performs when robust factor analysis methods are applied.
Entities:
Keywords:
COSMIN; Chronic illness; Long-term condition; Study validation; Type 2 diabetes mellitus
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