Background: In the routine care of diabetes, mostly the clinical parameters are controlled and little attention is\r\npaid to the quality of life assessment. A questionnaire must be culturally adapted in the country where it is intended\r\nto be used. The aim of the study was to assess health-related quality of life in youths with type 1 diabetes using the\r\nPedsQL 3.0 Diabetes Module and to evaluate the psychometric properties in patient and control subjects.\r\nMethods: Diabetes and Generic Module were administered to 355 youths with type 1 diabetes (8-18 y/o) and\r\ntheir parents. Generic Module was completed by 294 age-matched control participants and their parents. Feasibility,\r\ninternal consistency reliability, reproducibility, convergent, discriminant and concurrent validities were evaluated.\r\nResults: Minimal floor and moderate ceiling effects and hardly any missing item responses proved the feasibility.\r\nCronbach�s ? was gretaer than 0.70 in all subscales and met the criterion of 0.90 in total-items reliability. Testretest\r\nreliability was demonstrated with Pearson coefficients. We found good agreement between the children�s and\r\nparents�s answers, although parents underestimated their diabetic children in all subscales. The instrument was able\r\nto differentiate between the health-related quality of life of optimal, suboptimal and high risk metabolic control. The\r\nDiabetes Modul???? subscales and the Generic Module total scale correlated well, except the worry subscale.\r\nConclusions: Diabetic youths had similar health-related quality of life as their non-diabetic peers. Parents\r\nunderestimated their diabetic child�s quality of life, but this was not the case in the healthy population. Both diabetic\r\nand healthy boys had better perception of quality of life than girls. The nationally adapted version of the Pediatric\r\nQuality of Life Inventory 3.0 Diabetes Module designed for children and adolescents was reliable and valid instrument\r\nfor assessing health-related quality of life in youths with type 1 diabetes
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