PURPOSE: To examine the psychometric properties of the Norwegian version of the Audit of Diabetes-Dependent Quality of Life version 18 (ADDQoL-18). METHODS: We assessed the reliability (Cronbach's alpha and intraclass correlations) and construct validity (confirmatory factor analysis and Pearson's correlation coefficients) of the instrument in a sample of 292 adults in Norway aged 42.3 (SD 14.2) years. RESULTS: Internal consistency (Cronbach's alpha 0.88) and 4-week test-retest stability (intraclass correlations = 0.87) were satisfactory. Confirmatory factor analysis indicated that the one-factor structure of the ADDQoL-18 fits moderately (χ (2)/df ratio = 3.846, comparative fit index = 0.792, root mean square error of approximation = 0.099). Standardized coefficients showed that all domains loaded >0.4, except for one item. We found a satisfactory correlation between the ADDQoL-18 and the SF-36 Health Survey summary scales (physical health and mental health summary scales) and the Hospital Anxiety and Depression Scale. The total score was negatively associated with HbA1c (r = -0.18; P < 0.002), indicating that lower scores on the ADDQoL-18 were related to poorer glycemic control. Analysis regarding discriminant validity showed that the average weighted impact scores were mostly reduced among those reporting neuropathy and foot problems. CONCLUSIONS: The Norwegian version of the ADDQoL-18 showed high internal consistency, good test-retest reliability, and similar construct validity as the original instrument. Overall, the results supported the ADDQoL-18 being feasible for use in Norway.
PURPOSE: To examine the psychometric properties of the Norwegian version of the Audit of Diabetes-Dependent Quality of Life version 18 (ADDQoL-18). METHODS: We assessed the reliability (Cronbach's alpha and intraclass correlations) and construct validity (confirmatory factor analysis and Pearson's correlation coefficients) of the instrument in a sample of 292 adults in Norway aged 42.3 (SD 14.2) years. RESULTS: Internal consistency (Cronbach's alpha 0.88) and 4-week test-retest stability (intraclass correlations = 0.87) were satisfactory. Confirmatory factor analysis indicated that the one-factor structure of the ADDQoL-18 fits moderately (χ (2)/df ratio = 3.846, comparative fit index = 0.792, root mean square error of approximation = 0.099). Standardized coefficients showed that all domains loaded >0.4, except for one item. We found a satisfactory correlation between the ADDQoL-18 and the SF-36 Health Survey summary scales (physical health and mental health summary scales) and the Hospital Anxiety and Depression Scale. The total score was negatively associated with HbA1c (r = -0.18; P < 0.002), indicating that lower scores on the ADDQoL-18 were related to poorer glycemic control. Analysis regarding discriminant validity showed that the average weighted impact scores were mostly reduced among those reporting neuropathy and foot problems. CONCLUSIONS: The Norwegian version of the ADDQoL-18 showed high internal consistency, good test-retest reliability, and similar construct validity as the original instrument. Overall, the results supported the ADDQoL-18 being feasible for use in Norway.
Authors: Elizabeth A Pyatak; Kristine Carandang; Cheryl Vigen; Jeanine Blanchard; Paola A Sequeira; Jamie R Wood; Donna Spruijt-Metz; Robin Whittemore; Anne L Peters Journal: Contemp Clin Trials Date: 2017-01-05 Impact factor: 2.226
Authors: Anna Katharina Tietjen; Rula Ghandour; Nahed Mikki; Lars Jerdén; Jan W Eriksson; Margareta Norberg; Abdullatif Husseini Journal: Qual Life Res Date: 2021-03-02 Impact factor: 4.147
Authors: Žydrūnė Visockienė; Laura Narkauskaitė-Nedzinskienė; Roma Puronaitė; Aldona Mikaliūkštienė Journal: Health Qual Life Outcomes Date: 2018-11-01 Impact factor: 3.186