Eileen studied two identically sized populations of women, one in Springfield where the women were in their 50s and one in Mayfield where the women were in their 30s. The population with a lower incidence of breast cancer was
Springfield group Mayfield group.
A B
Breast cancer is rare in teens. It becomes more common as women get older.
breast cancer
older
more common
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older
lower incidence
women
breast cancer
breast cancer