Assessing the psychometric properthes of the ouality of life scale for diabetics(developing over aged 20-60)

Subject Areas : روان درمانگری

Saeedeh Bazazian ¹ ( PhD Islamic Azad University Abhar Branch )
Asadollah Rajab ² ( MD Iranian Diabetes Society Directorship and Pediatrics )

Received: 2015-06-04 Accepted : 2015-06-04 Published : 2010-06-22

Keywords: Reliability, confirmatory factor analysis, quality of life, validity, diabetics,

Abstract :

T his study assessed the reliability and validity of Quality of Life Scale for patients with diabetes (D-39, Boyer & Earp, 1997). 263 female and 197 male diabetic patients (age range 20-60 years) of the Iranian Diabetes Society completed the D- 39 and psychological well-being subscale of the Mental Health Inventory (Besharat, 1388). The coefficients of internal consistency and test-retest reliability, done in a 4 week interval, were 0.89 and 0.75 respectively. Results of principle component analysis using Promax rotation and confirmatory factor analysis revealed that the structure of the D-39 scale contains the following factors: diabetes control, energy and mobility, social burden, anxiety and worry, diabetes complications and other illnesses, and sexual functioning. These factors accounted for almost 64% of the variance. A significant negative correlation between the total score of the D-39, scores from its extracted sub-factors and the psychological well-being subscale of Mental Health Inventory confirmed the convergent validity of the scale. Differences among factors in the original scale and the Farsi version are discussed based on the age range of patients.