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To determine the influence of induced abortion on infertility, a total 179 infertile women were studied. We studied 115 women with primary infertility and 64 with secondary infertility who were registered, from 1973 to 1977 at Endocrine Clinic, Department of Obstetrics and Gynecology of St. Mary`s Hospital. The control group was 179 primipara who were delivered of their first babies in this hospital in the same period. For evaluation of correlationships between induced abortion and infertility, number of patients who experienced dilatation and curettage(D&C) for termination of pregnancy were compared between the two groups, secondary infertility and primipara. And also, number of patients with D&C in PID(pelvic inflammatory disease) group(179 Women) were compared with that of the control group. The results were as follows: 1. There are no women under the age of 20 in primary infertility, secondary infertility and in the control group. Number of women 26 to 30 years of age were 59(51.3%), 24(37.5%) and 101(56.4%) in the three groups respectively. There is no significant difference on the mean age between three is no significant difference on the mean age between three groups. 2. There were 41 cases(64.0%) and 29 cases(16.2%) which were related te bacterial infection in the secondary infertility and control groups. Among these, 21 and 9 cases were combined with D&C, but there was no significant difference between the two groups. 3. Number of women who experienced D&C were 35(54.7%), 107(59.8%) and 39(21.7%) In the secondary infertility, PID and control groups respectively. There is significant difference statistically on the number of D&C between the secondary inertility and control groups(P<0.01) and also the same result wes revealed between PID and the control groups(P<0.01). To verify the influence of induced abortion on infertility, we have to study the patients who complained infertility after D&C, but there are many difficult problems to collect the data in our hospital. So we performed retros
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