Evidence of Net Benefit of Mammography
Estimation of certainty and magnitude of net benefit (benefit minus harm):
- The USPSTF emphasizes the adverse consequences for most women—who will not develop breast cancer—and therefore use the number needed to screen to save 1 life as its metric. By this metric, the USPSTF concludes that there is moderate evidence that the net benefit is small for women aged 40 to 49 years.
- For biennial screening mammography in women aged 50 to 74 years, there is moderate certainty that the net benefit is moderate.
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