The Bradford Hill Criteria

At the end of last week’s look at HRT and breast cancer, I promised that I would look at “The Bradford Hill criteria” this week. The thing that prompted me to do this was that the headlines in the HRT/breast cancer study were “Risk of breast cancer nearly tripled...” The study claimed that the risk was 2-3 times higher for women taking the oestrogen/progesterone form of HRT relative to women not t...


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