In an unadjusted model, women who took the pill from age 18 or younger were diagnosed with breast cancer an average of 17 years earlier than those who started taking it over the age of 30, the study of more than 1,000 women diagnosed with breast cancer at a UK hospital over a 27 year period found.
Adjusting for year of birth reduced the age difference to three years. But further controlling for number of live births, age at menarche and length of OCP use narrowed the confidence intervals and raised the difference in age at diagnosis to four years.
Similarly, those who started taking the pill between 22 and 25 years of age were diagnosed with breast cancer an average of...
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