However, the difference in FF was statistically highly significant ( p <0.0001) even on multivariate analysis adjusted for BMI and PAPP-A levels, indicating that ART was almost certainly an independent predictor of low FF.
Consequently, all over the world, there is an increasing trend towards ‘freeze all’ cycles in ART practice [ 85 , 86 ], and a higher number of frozen embryo transfers are being performed to avoid the risk of OHSS and for endometrial optimization in subsequent cycles leading to oocyte retrieval.