title: BELIEFS ABOUT MEDICINES IN PATIENTS WITH HYPERTENSION: THE INSTRUMENT VALIDITY AND RELIABILITY IN IRAN.
abstract: OBJECTIVE
  Despite the importance of patients believes as one of the most important predictors of treatment adherence behavior, it is rarely considered in numerous studies. Then the current survey was aimed to develop and study the beliefs about medicines questionnaire (BMQ) in patients with hypertension.
  
  
  METHODS
  The BMQ developed by Horn and et al. was used in the current study. This questionnaire included 18 questions in both public and private beliefs regarding drug. Face and content validity of the tool was investigated using expert's panel. In final, aforementioned tool was tested in 612 participants. To explore structure validity and internal consistency, exploratory and confirmatory factor analysis and alpha coefficient was conducted. To evaluate the final validity of instrument, the mean score of the beliefs about medicines of patients with appropriate medication adherence were compared to patients without medication adherence.
  
  
  RESULTS
  The mean age of patients was 44.08 ± 10.38 years. Women were 314 of participants. Calculated face validity by the impact score for each item indicated that all the items of the questionnaire had the impact score of more than 1.5. In total, all items had scored higher than 0.79 by considering 18 items for content validity. The average of content validity index for the questionnaire was 0.93. Load of factors were in the range of 0.51 to 0.79. Four items explained % 57 of the total variance. Comparison of all instrument items in the two groups showed that patients with good adherence had higher score in 15 items (% 83 of all items).
  
  
  CONCLUSIONS
  The findings suggested that the BMQ in patients with hypertension as a valid and reliable instrument can be used to evaluate the patients' medication adherence.
authors.affiliation: Department of Health Education and Health Promotion, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Firoozeh
authors.initials: F
authors.lastname: Mostafavi
authors.affiliation: Department of Health Education and Health Promotion, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Arash
authors.initials: A
authors.lastname: Najimi
authors.affiliation: Department of Public Health, Faculty of Health, Qom University of Medical Sciences, Qom, Iran.
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Sharifirad
authors.affiliation: Department of Community Medicine, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Parastoo
authors.initials: P
authors.lastname: Golshiri
keywords: BMQ; Belief; Hypertension; Medication adherence