Development and reliability and validity test of a questionnaire on beliefs about medication of chronic heart failure patients

MENG Jing; JI Shi-ming; GUO Hong; HAO Yu-fang; LI Zheng; ZHOU Ying-ping

Abstract：Objective To develop a questionnaire for measuring medication-related beliefs of chronic heart failure( CHF)patients and to test its reliabil-ity and validity. Methods On basis of literature review and indepth interview of CHF patients and doctors,the original scale was designed,then the expert team evaluated its content validity. A total of 320 CHF patients were recruited to complete the questionnaire,and exploratory factor analysis and confirmatory factor a-nalysis were conducted to evaluate the construct validity. Besides,the internal consistency of the questionnaire was measured. Results The final questionnaire in-cluded 4 factors( perceived efficacy,perceived necessity of medication,medication concerns,medication convenience)and 12 items,which was consistent with the theoretical framework. The content validity indexes of all items were ranged from 0. 8 to 1,and content validity was 0. 94. The result of Exploratory factor anal-ysis revealed that the item loads were range form 0. 506 to 0. 808,and the cumulative variance contribution rate was 60. 37%. Results of confirmatory factor analy-sis indicated that the indicators all met the requirements of scale. The Cronbachˊsαcoefficient was 0. 75. Conclusion The indicators of questionnaire measuring medication-related beliefs of chronic heart failure( CHF)patients all meet the general requirement of scale. It can be used to measure medication-related be-liefs among chronic heart failure patients and be improved step by step.