RESUMO
Diabetes with permanent changes in a person's lifestyle may influence diabetic adolescent quality of life [QOL] negatively. Studies conducted on diabetic patients are increasingly measuring patient-centered outcomes such as functional status and health-related QOL [HRQOL]. The development of a HRQOL questionnaire with an optimal measuring performance provides nurses with a standardized assessment tool in order to determine the impact of the disease on diabetic adolescent girl's activity daily living. This study aimed to develop and assess psychometric properties of [Iranian Diabetic Adolescent Girl's QOL [IRDAGQOL]] questionnaire. The items and content of [IRDAGQOL] questionnaire were generated from themes and items extracted from a qualitative study using content analysis approach with the participation of 20 adolescent girls with diabetes. Face validity of questionnaire with the participation of 10 adolescent girls and content validity by 15 experts, was approved. Convergent and discriminant validity of questionnaire confirmed. Exploratory factor analyses using principal component extraction method was performed to determine the questionnaire domains. The Cronbach's coefficient alpha was calculated to determine the instrument internal consistency in 250 samples. In 30 samples, using SPSS statistical package, test re-tests after 2 weeks confirmed questionnaire reliability. The patient interviews allowed for the identification of 50 items in the final questionnaire. Principal components analysis revealed the presence of five components that jointly accounted for 79.945% of the variance. The face and content validity processes resulted in an approved and valid questionnaire. Reliability analysis showed satisfactory result [Cronbach's alpha = 0.870]. The findings showed that the [IRDAGQOL] questionnaire presented in this study is a valid and reliable instrument that can be used for measuring adolescent girl's QOL