Ectopic pregnancy, the need for standardisation of rate.

Reported incidence of ectopic pregnancy (EP) varies widely in the literatures. Due to individual definition of the denominator used the incidence of EP, it has been expressed in various ways that are not easily comparable. Controversy has arisen over the best denominator in reporting the incidence of EP. The three commonly used denominators are the number of births, the number of pregnancies and the number of women of reproductive age (15-44 years). A reliable calculation of the incidence of EP is necessary to provide accurate information on the rate of this condition which is vital in planning health policies.