The high-quality embryo rate of 51.9 % , biochemical pregnancy rate of 51.0 % , clinical pregnancy rate of 44.2 % and endometrial thickness of ( 10.84 + / - 1.75 ) mm in the intervention group were all significantly higher than those in the control group [ 48.7 % , 38.9 % , 34.8 % , and ( 10.52 + / - 1.50 ) mm , respectively ; P < 0.05 ] .