Results
This study was conducted on 168 female students in the 14-year-olds age group. See the study steps in the CONSORT diagram (Fig. The participants' descriptive characteristics are listed in Table Demographic variables in intervention and control groups before the interventionIn the intervention group, almost three quarters of students (75%) had fathers with their own business (freelancers). Most mothers (82.1%) were homemakers. 50% of students’ fathers and 51.2% of their mothers had high-school diploma. Most of the participants (50%) were reported to come from good -income families, with an exception of 14.3% who came from rich families.In the control group, most of the students' fathers were retired (28.6%). Also, most mothers (54.8%) were homemakers. 44% of students’ fathers and 38.2% of their mothers had high-school diploma. In this group too, most of the participants (33.3%) were reported to come from good -income families, with an exception of 27.4% who came from rich families.Despite randomization, the two groups differed slightly at baseline by some demographic characteristics. However, in the variables of age, gender, educational level and father's education, they were homogeneous. The socio demographic variables were measured by ordinal scale and cannot considered as a covariate. Since these socio demographic variables effect on Pretest, thus scores of each variable in pre-test considered as a covariate in ANCOVA. The result showed that the mean and standard deviation of all the components of knowledge, attitude and behavior in the intervention group has increased compared to the control group, and was significant (Comparison of groups in terms of Knowledge, attitude and behavior before and after interventionThe mean score of knowledge, health beliefs and behavior in the experimental and control groups before and after the intervention is presented in Fig. Estimated Marginal Means of knowledge, Health beliefs and Behavior