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In: Intrauterine contraception: advances and future prospects, edited by Gerald I. Zatuchni, Alfredo Goldsmith, and John J. Sciarra. Philadelphia, Pennsylvania, Harper and Row, 1985. 354-64. (PARFR Series on Fertility Regulation)Little data is available from developing countries on the incidence of ectopic pregnancy and the associated risk factors: pelvic inflammatory disease (PID), sexually transmitted diseases (STDs), intrauterine devices (IUDs), and abortion. To address this problem, the World Health Organization conducted a multinational case-control study between 1978 and 1980 of factors associated with ectopic pregnancy in 12 centers, 8 in developing countries and 4 in developed countries. Results suggest that risk factors are similar in women from developing and developed countries. The only exceptions were increased risks of ectopic pregnancy associated with spontaneous abortion or smoking in developing but not developed country centers. This may reflect misreporting of illegal induced abortion or postabortion complications, and behavioral differences between smoking and nonsmoking women in developing countries. All methods of contraception prevent pregnancy and so provide protection against ectopic pregnancy. This protective effect is least with the IUD, however, and accidental conceptions during IUD use or after sterilization carry an increased risk of ectopic pregnancy. With the IUD, this probably reflects both differential protection against intrauterine and extrauterine pregnancy and an increased risk of IUD-related PID resulting in tubal damage. The risk of ectopic pregnancy is also increased in women with a previous history of PID or a prior pregnancy. However, cesarean section was found to reduce the risk of ectopic gestations in all comparison groups.