The per-protocol analysis revealed no significant differences in the rate of implantation ( 29.8 % in eSET vs. 29.7 % in DET ; p = 0.98 ) , in cumulative pregnancy rates per transfer ( 49.1 % in eSET vs. 46.9 % in DET ; p = 0.80 ) or in the cumulative live birth delivery rate ( 38.6 % in eSET vs. 42.2 % in DET ; p = 0.69 ) .