Construction and reliability and validity of the Chinese revised vascular quality of life questionnaire

Abstract

Objective To translate and optimize the vascular quality of life questionnaire (VascuQOL) into Chinese, and to obtain a VascuQOL version which is adapted to Chinese culture and language. Methods VascuQOL was translated into Chinese through sequential translation, back translation, revision of the VascuQOL items, expert consultation, cultural adaptation and pre-investigation. Then 302 patients with lower extremity arteriosclerosis obliterans in Department of Vascular Surgery of the First Affiliated Hospital of Chongqing Medical University were enrolled as the research objects, and the reliability and validity of the questionnaire were tested. Results The threshold ratio of each item of VascuQOL ranged from 3.086 to 17.605. The correlation coefficient between each item score and total score of the scale was in a range of 0.237 to 0.695 (P < 0.01). The content validity of each item ranged from 0.861 to 1.000, and the content validity of the total scale was 0.986. Exploratory factor analysis (EFA) found 5 common factors with characteristic roots larger than 1, with a cumulative variance contribution rate of 67.39%. The Chi-square value of Bartlett's spherical test was 3 289.061(P < 0.01). With Health Questionnaire EQ-5D-5L as the calibration criterion, the result of Pearson correlation analysis was 0.697. The Cronbach's α coefficient of internal consistency reliability was 0.871, and that of each dimension were 0.893, 0.859, 0.759, 0.569 and 0.727, respectively (P < 0.01). The test-retest reliability was 0.996. Conclusion Our Chinese revised VascuQOL has good reliability and validity and can be used to assess the quality of life of patients with lower extremity arteriosclerosis obliterans in China.

Keywords

• arteriosclerotic obliterans
• peripheral artery disease
• quality of life
• scale
• reliability
• validity