Abstract
Previous conceptions are one predictor for the outcome of assisted reproductive technology procedures. Approximately 18–34% of clinical pregnancies following assisted reproduction procedures result in spontaneous abortion. The risk of such pregnancy loss is believed to increase with women's age, previous miscarriages and use of frozen–thawed embryos. This study analyses German IVF Registry data to examine the impact of previous miscarriages on the outcome of assisted reproduction procedures. The data set consists of a total of 174,909 assisted reproduction procedures performed between January 1998 and December 2000. Multiple logistic regression is used to assess the correlation between women's age, spousal/partner change, and infertility diagnosis. It is demonstrated that any previous miscarriage will increase the treatment-dependant miscarriage rate in assisted reproduction procedures. A significantly higher impact is shown for one previous miscarriage achieved by assisted reproduction procedures compared with spontaneous conception. Partner change is shown to have no specific impact on the treatment dependant miscarriage rate, whereas a statistically significant increase in miscarriages in all assisted reproduction procedures was found among women older than 34 years of age. Overall, the highest rate of treatment-dependant miscarriages was seen in assisted reproduction procedures with cryopreserved embryo transfer.
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