Psychometric properties of the scale on the related factors to smoking prevention among students of Shahid Beheshti University of Medical Sciences based on Health Belief Model

Despite the effectiveness of interventions based on the Health Belief Model (HBM) on improving the smoking preventive behaviors and the necessity of smoking prevention among students, there is no standard questionnaire in this regard in Iran. Therefore, in this study, the validity and reliability of the scale related to the smoking prevention factors among students based on the HBM were assessed. The present analytical cross-sectional study was carried out among 348 dormitory students of Shahid Beheshti University of Medical Sciences, Tehran, in 2016. Single-stage cluster sampling was conducted. Qualitative and quantitative methods were used to assess the face and content validity. The reliability of the scale and the structure validity were determined using Cronbach's alpha coefficient and confirmatory face analysis. Lisers 8.8 and SPSS 16 software were used to analyze the data. All stages of the study were conducted ethically. Impact score, content validity ratio and content validity index of the structures of the scale were in the range of 4.1 - 4.5, 0.79 - 0.97 and 0.90 - 0.96, respectively. Cronbach's alpha coefficient for structures of the scale was obtained from 0.70 to 0.90. Five-factor model including perceived susceptibility, severity, barriers, benefits and self-efficacy were confirmed (RMSEA = 0.081, CFI = 0.96, X2/df = 3.25). Scale on the related factors to the smoking prevention based on HBM had the validity and reliability in the target population of the students.