Figure 3.

Overdiagnosis in women undergoing biennial screening, ages 50 to 74 years. For women undergoing biennial screening starting at age 50 years, the mean predicted overdiagnosis rate is shown by the height of each bar for each screen until age 74 years (gray lines represent the 95% prediction intervals). There are 2 sources of overdiagnosis: the detection of progressive preclinical cancer that would not have progressed to clinical cancer before death from a breast cancer unrelated cause (white) and the detection of nonprogressive preclinical cancer (green).