It’s the combination of estrogen and progesterone (HRT), the WHI still maintains, that raises the risk.12 But as we will show in chapter 2, that finding was due to a statistical misinterpretation: The women on HRT did not have an increased risk; the control group had a reduced risk, because many of the women in that group had been on estrogen before the study. When they were removed from analysis, the supposed increased risk of HRT vanished.
