In order to assess the difference in growth and development between the stimulated and natural pregnancies, we compared the sonographic measurememt of early embryos from the fifth to seventh gestational week, in terms of mean size of gestational sac, crown rump length, fetal heart rate and yolk sac size between 26 ovulation stimulated pregnancies and 38 natural pre gnancies. The two groups were compared by multiple regression analysis, The data suggest that there is atrend that embryos smaller in stimulated pregnancies though significant statistical differences was not proved.
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