A study published Tuesday in the Journal of the American Medical Association finds that it’s cost-effective for women to begin yearly mammograms at the age of forty and then have bi-annual tests after the age of fifty. Dr. John Rosenquist and Dr. Karen Lindfors, co-authors of the recently published study, found that it costs $2,972 for women to receive mammograms every year from the ages of 40 to 79. The outcome is generally an addition of forty days to a woman’s life. However, yearly mammog rams from the age of forty to forty nine and bi-annual tests after fifty would cost $1,915 and add an average of thirty-five days to a woman’s life. The averages generally mean that for women who don’t have breast cancer, the lifespan remains the same. But, Rosenquist indicates that for women who do have breast cancer could add years to their lives.