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Psychometric properties of Persian Diabetes-Mellitus Specific Quality of Life (DMQoL) questionnaire in a population-based sample of Iranians
Health Research Center, Life Style Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Division of Psychology, Department of Psychiatry, Duke University Medical Center, Durham, NC, United States.
Duke University Medical Center, Durham, NC, United States.
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2019 (English)In: International Journal of Diabetes in Developing Countries, ISSN 0973-3930, E-ISSN 1998-3832, Vol. 39, no 1, p. 218-227Article in journal (Refereed) Published
Abstract [en]

Health-related quality of life (HRQoL) among patients with diabetes mellitus is often poorer than in those with other chronic medical conditions. Appropriate disease specific measures are needed to measure HRQoL in these patients. This study sought to validate a culturally adapted version of the Diabetes-Mellitus Specific Quality of Life (DMQoL) questionnaire module in Persian. Concurrent validity of the scale was assessed by the Diabetes Quality of Life (DQOL) questionnaire. Convergent and discriminative validity of the DMQoL was determined using a brief version of World Health Organization’s Quality of Life Scale Brief version (WHOQOL-BREF), Hospital Anxiety and Depression Scales (HADS), and Medication Adherence Report Scale (MARS). Construct validity was examined using confirmatory factor analysis. Rasch analysis was also performed to examine the unidimensionality of the DMQoL. Known-group method was used to examine the ability of the scale to differentiate between different categories of patients. A sample of 824 patients (512 females) with diabetes mellitus was recruited from diabetic care centers located in Qazvin, Iran. The mean age of participants was 54.1 (SD 6.3) and 27% were smokers. All items loaded on a single factor (factor loadings ≥ 0.6) and internal consistency of the scale was acceptable (α = 0.89). Significant associations were found between the scale and DQOL, indicating concurrent validity (p < 0.001). The DMQoL was able to differentiate subgroups of patients with hypertension, HbA1c, cholesterol, and diabetic diet. All items were appropriate with regard to difficulty level and confirmatory factor analysis verified the scale’s single dimension (CFI = 0.927; RMSEA = 0.067). Persian DMQoL is a reliable and valid measure of HRQoL in a Persian-speaking population with type II diabetes. Further assessment is needed to confirm the psychometric properties of the scale in other cultures and languages. Future studies are needed to determine the sensitivity of the scale to change over time in response to treatment. 

Place, publisher, year, edition, pages
Springer, 2019. Vol. 39, no 1, p. 218-227
Keywords [en]
Diabetes mellitus, Health-related quality of life, Psychometrics, Reliability, Validity
National Category
Endocrinology and Diabetes Psychology
Identifiers
URN: urn:nbn:se:hj:diva-43415DOI: 10.1007/s13410-018-0648-8ISI: 000462651700032Scopus ID: 2-s2.0-85063024693Local ID: HHJÖvrigtISOAI: oai:DiVA.org:hj-43415DiVA, id: diva2:1301728
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-05-08Bibliographically approved

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Pakpour, Amir H.

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