Analysis of retained placenta associated with saline abortion: Methodologic considerations

Gary S. Berger, Thomas D. Kerenyi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In order to determine the incidence of spontaneous placental delivery and placental retention associated with midtrimester abortion induced by hypertonic saline, the competing risk of operative removal of the placenta was eliminated by analyzing the data according to the multiple decrement life table method. This method of analysis revealed that the hour-specific rate of spontaneous delivery of the placenta was greatest in the first hour and became progressively lower the longer the placenta remained in utero. The cumulative rate of retention of the placenta was 46 per cent at the end of the first hour and 22 per cent at the end of the fourth hour. Compared with the simple frequency distribution method, multiple decrement life table analysis adjusts for the confounding effect of operative intervention, thus permitting a more accurate understanding of the probability of spontaneous termination of the third stage of labor.

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalAmerican Journal of Obstetrics and Gynecology
Issue number4
StatePublished - 15 Oct 1974
Externally publishedYes


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