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Forest plot of the study-specific (boxes) and summary (diamond) relative risk and 95% confidence intervals (lines) for ovarian cancer risk per five years of estrogen therapy use. The overall summary ovarian cancer risk per five years of estrogen therapy use is 1.22 (95% CI 1.18–1.27, p<0.0001). First author for each study is given on the vertical axis, together with the study reference number.
ET – estrogen-alone therapy.
RR – relative risk
