Main findings
In the present study, we found that the ongoing pregnancy rate was
similar in the PPOS group and the antagonist group. In order to control
for the differences in the demographic and index stimulation cycle
characteristics, a multivariate logistic regression was performed and
indicated the stimulation protocol was one of the factors predicting the
ongoing pregnancy rate of IVF. Our results were in agreement with that
of a previous study 12which showed lower pregnancy rates in recipients of oocytes from the MPA
group compared to that from the antagonist group.