Estimate the rate ratio comparing current users vs. never users, and provide a 95% CI about this
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Cancer
The data relating oral-contraceptive (OC) use and the incidence of breast cancer in the age group 4044 in the NHS are given in Table 14.31.
Table 14.31: Relationship between breast-cancer incidence and OC use among 40- to 44-year-old women in the NHS
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Number of Number of OC-use group person-years 4,761 121,091 cases Current users Past users Never users 13 164 113 98,091
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