1.   But later the incidence of heart attacks declined, so that in the end estrogen had no effect on heart attack incidence.

2.   Other studies show estrogen has considerable benefits.

3.   Weak estrogens do not have the same actions as the strong hormones that the body produces.

4.   An expert not involved in the study said the research was significant as another demonstration that estrogens have positive effects on certain aspects of mental function.