Differences in estimates reflect the different screening periods, as well as methodological differences (including which trials are deemed sufficiently robust and unbiased). † Estimated that 3.36% of all women screened each year receive a false positive result. ‡ Estimated that the cumulative risk of a false positive result after 10 mammograms is around 20-60%. ¶ Concluded that the results are conflicting but that a false positive result can cause breast cancer specific psychological distress for up to three years. § Acknowledges that false positive results "can lead to psychological harms."

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