First, is there evidence that mammography screening reduces my chance of dying from breast cancer? The answer is yes. Out of every one thousand women who did not participate in screening, about five died of breast cancer, while this number was four for those who participated. In statistical terms that is an absolute risk reduction of one in one thousand.22 But if you find this information in a newspaper or brochure, it is almost always presented as a “20 percent risk reduction” or more.
