Fig. 4

IR per embryo transferred in relation to number of blastomeres, fragmentation and symmetry, evaluated manually. Legend: Implantation rate (IR) (n embryos implanted/n embryos transferred) was calculated for embryos transferred in SET or DET with 0 or 100 % implantation. P values were calculated using Cochrane-Armitage test. Significant p-values (<0.05) are marked with *. Higher number of blastomeres after overnight culture and higher blastomere symmetry after warming were significantly associated with higher IR. Embryos in morula stage after warming (n = 4) are included in the group of >9 blastomeres. Fragmentation and symmetry was not evaluated for embryos in M or EB stage (n = 4 after warming; n = 253 after overnight culture). Embryos with >25 % fragmentation after warming are not included in the graphs because of the low number (n = 5 after warming, n = 7 after overnight culture). M = morula; EB = early blastocyst