The effect of education based on the theory of planned behavior on the intention of vaccination against human papillomavirus in female students: A controlled educational trial

BACKGROUND: Human papillomavirus (HPV) is the most common sexually transmitted infection and causes more than 90% of cervical cancers. The highest rate of infection occurs between the ages of 18 and 28. This study aimed to determine the effect of education based on the theory of planned behavior (TPB) on the intention of vaccination against HPV in female students. MATERIALS AND METHODS: This controlled educational trial study was performed on 72 female students aged 18-26 years of Mashhad University of Medical Sciences by random assignment to intervention and control groups. For random assignment in the intervention and control groups, random blocking with four blocks was performed using a random number table with a ratio of 1:1. Data collection tools included demographic questionnaire, awareness about HPV vaccination, and TPB theory constructs. The control group was received the university routine training. The intervention group was received the virtual group training in four sessions, 60-90 min at weekly intervals and with educational content including TPB constructs on HPV vaccination with the method of lecture training, group discussion, questions and answers, and presentation of training package. Questionnaires were completed before, instantly, and 1 month after the educational intervention. Data were analyzed using the Chi-square test, Fisher's exact, t-test, Mann-Whitney test, and Friedman test. RESULTS: The mean age of students was 18.9 ± 1.1 years. The intervention and control groups were homogeneous in terms of demographic characteristics (P > 0.05). Before the intervention, the mean score of model constructs did not show a statistically significant difference between the two groups (P > 0.05), but after the intervention, in the intervention group, mean scores of attitude, subjective norms, perceived behavioral control, and behavioral intention in the intervention group was significantly higher than the control group (P < 0.001). In the intervention group, the difference in the mean score of HPV vaccination intention instantly (P < 0.001) and 1 month (P < 0.001) after the intervention significantly increased. CONCLUSION: TPB-based education was effective in increasing attitudes, subjective norms, and perceived behavioral control and the intention to vaccinate against HPV in the female students of Mashhad University of Medical Sciences. Therefore, it is suggested that the present educational intervention be widely used to educate female students.