In this study, the upper limit of the two-sided 95% CI of the incidence of endometrial hyperplasia was higher than the upper limit of 2%, and is therefore not considered acceptable. -The endometrial safety of the combination of oestrogen and progestogen for the new ratio of 0.5mg/ 0.1mg cannot be extrapolated from the already licensed dose of Activelle, which contains 1mg estradiol and 0.5mg NETA.