Dydrogesterone relieves pain without inhibiting ovulation, so that patients are able to become pregnant during treatment.

Combined oral contraceptives reduce the risk of pregnancy primarily by inhibiting ovulation.

Because lactation inhibits ovulation, mothers who breastfeed are less likely to conceive.

The minimum dose required to inhibit ovulation has been found to be approximately 1 mg.

The minimum effective dose of oral dienogest required to inhibit ovulation is 1 mg/day.

Oral contraceptives inhibit ovulation and so prevent conception.

Anything that inhibits ovulation - eg, pregnancy or oral contraception - reduces the risk of ovarian cancer.

Decreased risk of endometrial cancer is associated with parity and lactation, perhaps by inhibiting ovulation.

Lactation inhibits ovulation in some women, thus the practice has a rational basis.

More lactation in the lifetime of non-western women inhibits ovulation and extends the number of fertile years.