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© 1994 Oxford University Press

research-article

Intrauterine Device Use and Risk of Tubal Pregnancy: An Indonesian Case-Control Study

BASTAMAN BASUKI*, MARY ANNE ROSSING**,{dagger} and JANET R DALING**,{dagger},

* Department of Community Medicine, Medical School, University of Indonesia Jakarta, Indonesia
** Department of Epidemiology, School of Public Health and Community Medicine, University of Washington Seattle, WA, USA
{dagger} Division of Public Health Science, Fred Hutchinson Cancer Research Center Seattle, WA, USA

Reprint requests to: Dr Janet R Daling, Fred Hutchinson Cancer Research Center, 1124 Columbia Street, MP-381, Seattle, WA 98104, USA

BACKGROUND: We assessed the risk of tubal pregnancy among women who (1) were currently using an intrauterine device (IUD) and (2) had discontinued IUD use while still sexually active and at nsk of pregnancy using data from a multicentre case-control study of married women conducted In Indonesia.

METHODS: Cases were 560 women diagnosed with histologically confirmed ectopic pregnancy from April 1989 to August 1990 at any one of 11 participating hospitals. Controls were 1120 non-pregnant women similar in age and place of residence to the cases. In-person interviews were conducted to collect information regarding current and past contraceptive use as well as other demographic and personal characteristics.

RESULTS: Women currently using an IUD were considerably less likely than women not currently using contraception, but more likely than users of hormonal or surgical means of contraception, to develop a tubal pregnancy. Women who had discontinued using an IUD had a 70% subsequent increase in risk of tubal pregnancy (adjusted RR = 1.7, 95% CI: 1.1–2.5) relative to women who had never used an IUD. This increase in risk was most pronounced in women who reported multiple episodes of IUD use and, to a lesser extent, in women with a long (>3 year) duration of IUD use.

CONCLUSIONS: The associations we observed are similar to those previously reported in studies conducted in developed countries. The results are of particular interest because this study was conducted in a location in which the Dalkon Shield IUD was never available, and among a population of married, gravid women for whom IUD use is generally considered most appropriate.

Received 1 March 1994


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