Reliability and validity of the Malay translated version of diabetes quality of life for youth questionaire
Introduction: Many studies reported poorer quality of life (QoL) in youth with diabetes compared to healthy peers. One of the tools used is the Diabetes Quality of Life for Youth (DQoLY) questionnaire in English. A validated instrument in Malay is needed to assess the perception of QoL among youth with diabetes in Malaysia.
Objective: To translate the modified version, i.e., the DQoLY questionnaire,into Malay and determine its reliability and validity.
Methods: Translation and back-translation were used. An expert panel reviewed the translated version for conceptual and content equivalence. The final version was then administered to youths with type 1 diabetes mellitus from the universities and Ministry of Health hospitals between August 2006 and September 2007. Reliability was analysed using Cronbach’s alpha, while validity was confirmed using concurrent validity (HbA1c and self-rated health score).
Results: A total of 82 youths with type 1 diabetes (38 males) aged 10-18 years were enrolled from eight hospitals. The reliability of overall questionnaire was 0.917, and the reliabilities of the three domains ranged from 0.832 to 0.867. HbA1c was positively correlated with worry (p=0.03). The self-rated health score was found to have significant negative correlation with the “satisfaction” (p=0.013) and “impact” (p=0.007) domains.
Conclusion: The Malay translated version of DQoLY questionnaire was reliable and valid to be used among youths with type 2 diabetes in Malaysia.
Jacobson AM, the DCCT Research group: The Diabetes Quality of Life Measures. In: Bradley C, ed. Handbook of Psychology and Diabetes: A Guide to Psychological Measurement in Diabetes Research and Practice. Chur, Switzerland. Harwood Academic Publishers; 1994, p. 65-88.
Jacobson AM, Samson, JA, De Groot M: The evaluation of two measures of quality of life in patients with Type 1 and Type 2 diabetes. Diabetes Care 1994;17:267-74.
The DCCT Research Group. Reliability and validity of diabetes quality of life measure for the Diabetes Control and Complication Trial (DCCT). Diabetes Care 1998;11:725-32.
Howie LJ, Drury TF. Current estimates from the Health Interview Survey: United States—1977. Vital Health Stat 10. 1978;126:1-98.
Ingersoll GM, Orr DP. Behavioural and emotional risk in early adolescents. J Early Adolescence 1989;9:396-408.
EuroQol Group 2003. Translation guidelines (online). Available at: www.euroqol.org/web/files/Translation_guidelines.pdf. 8 September 2005.
Huang IC, Liu JH, Wu AW, et al. Evaluating the reliability, validity and minimally important difference of the Taiwanese version of the diabetes quality of life (DQOL) measurement. Health Qual Life Outcomes 2008;28(6):87.
Correr CJ, Pontarolo R, Melchiors AC, et al. Translation to portuguese and validation of the Diabetes Quality Of Life Measure (DQOLBrazil). Arq Bras Endocrinol Metabol 2008;52(3):515-22.
Yildirim A, Akinci F, Gozu H, et al. Translation, cultural adaptation, cross-validation of the Turkish diabetes quality-of-life (DQOL) measure. Qual Life Res 2007;16(5):873-9.
Kuttz SMS. Adherence to diabetes regimens: Empirical status and clinical applications. Diabetes Educ 1990;16(1):50-9.
Anderson B, Laffel L. Behavioral and psychosocial research with school-aged children with type 1 diabetes. Diabetes Spectrum 1997;10: 277-81.
Bujang Mohamad Adam, Ghani Puzziawati Ab, Soelar Shahrul Aiman, Zulkifli Nor Aizura. Sample size guideline for exploratory factor analysis when using small sample: Taking into considerations of different measurement scales, Statistics in Science, Business, and Engineering (ICSSBE), 2012. doi: 10.1109/ICSSBE.2012.6396605.
Gorsuch, R. L. (1983) Factor analysis, 2ND EDN. Hillsdale, NJ: Erlbaum.