Sample Size Determination The sample size is determined considering both the intervention and control group proportion. The sample size for dichotomous outcome is recommended based on an assumption of superiority trial hypothesis testing. The hypothesis of the researcher is that implementation of the new community based prevention intervention program to prevent domestic violence against women will have significant effect than the standard (existing) prevention program in public health point of view. So the corresponding null hypothesis (Ho) is that: the new community based preventive intervention is not more efficacious to prevent domestic violence against women than the comparison group based on public health relevance. In addition, the sample size is determined considering an assumption of 5% margin of error, 95% significance level and 80% power.