Document Type : Original Article
Authors
1 Food Security Research Center
2 Department of Epidemiology and Biostatistics, School of Health, Isfahan University of Medical Sciences, Isfahan,
3 Public Health Department, School of Health, Qom University of Medical Sciences, Qom, Iran
Abstract
Introduction: Measurement tools designed to ensure the achievements of studies’ objectives
must be evaluated. Based on the health promotion model (HPM), the present study was
conducted to assess the validity and reliability of the designed questionnaire of hypertensive
patients’ nutritional perceptions. Methodology: In a cross‑sectional study, the mentioned
questionnaire was assessed based on opinions of 11 experienced faculty members and
671 hypertensive patients in rural areas in the year 2013. To evaluate the reliability, internal
consistency (Cronbach’s alpha) was calculated. Concerning the validity of the questionnaire,
its content and construct validity were examined. Data analysis was performed using
Statistical Package for the Social Sciences version 18 (SPSS Inc., Chicago, IL, USA).
Results: Spearman‑Brown and Cronbach’s alpha coefficients results were acceptable in all
constructs indicating a satisfactory reliability of the questionnaire. Questionnaire’s questions
were highly correlated with the total score signifying the internal consistency of the questions;
therefore, all questions had a similar effect on the total score and the removal of each did no
increase the alpha significantly (all questions had acceptable reliability). Factor analyses showed
that all questions had acceptable factor loading and suitable validity. Moreover, the entire
constructs of the questionnaire were approved by experts with high validity coefficient of 0.9.
Conclusion: The designed questionnaire for assessment of the HPM constructs regarding
hypertensive patients’ nutritional issues had appropriate psychometric characteristics. Reliability
and validity of the questionnaire were also satisfactory and its overall structure was approved.
Keywords
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