Content Validity and Reliability of the Health Belief Model Questionnaire For Type II Diabetic Patients

Data collection is a crucial step in any study, requiring access to a valid and reliable tool. The health belief model has long been utilized to promote preventive behaviors across various domains. Therefore, this study aims to develop a valid and reliable tool for assessing preventive behaviors in individuals with type II diabetes, based on the constructs of the health belief model.

This methodological study, conducted from 2017 to 2018, involved extracting instrument items from two sources: 1) a review of relevant texts and articles, and 2) an examination of existing questionnaires. The tool's psychometrics were evaluated using classical test theory. To establish the tool's validity, face and content validity were assessed, while Cronbach's alpha coefficient was employed to determine internal consistency. The findings were analyzed using SPSS 24 software.

During the content validity stage, the average CVR and CVI were found to be 0.91 and 0.98, respectively. Cronbach's alpha coefficients for the constructs were as follows: perceived sensitivity 0.56, perceived intensity 0.83, perceived barriers 0.71, perceived benefits 0.86, self-efficacy 0.82, and cues to action 0.79. The overall internal consistency, measured by Cronbach's alpha, was 0.82.

This study's findings demonstrate that the preventive behaviors questionnaire, based on the health belief model's constructs, exhibits good validity and reliability for use in individuals with type II diabetes.