Specifically, women with a high school education or higher are 1.5 times more likely to have knowledge than a lower secondary school level (95% CI: 1.12 - 2.02); women who have ever had access to information about BC have 2.8 times higher knowledge than the group who have never had access (95% CI: 1.54 - 5.09); Women in Cat Hai have 2.49 times higher knowledge than women in Thuy Nguyen (95% CI: 1.79 - 3.44).