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. 2014 Jun 4;31(8):1105–1110. doi: 10.1007/s10815-014-0266-4

Table 2.

Comparison of patient and cycle characteristics when embryo transfer was performed at the cleavage stage or at the blastocyst stage

Variable Cleavage stage embryo transfer (n = 203) Blastocyst stage embryo transfer (n = 922) p
Female Age (years) 32.01 ± 4.54 31.08 ± 4.23 0.182
Male age (years) 36.55 ± 7.08 36.82 ± 6.73 0.459
FSH dose (IU) 2,221 ± 577 2,282 ± 995 0.486
No. of follicles 18.03 ± 8.02 21.5 ± 11.03 0.326
No. of oocytes retrieved 15.4 ± 3.11 18.9 ± 6.03 0.541
No. of MII oocytes 10.05 ± 4.21 13.31 ± 4.05 0.3221
Fertilisation Rate 79.3 ± 13.8 80.3 ± 13. 0.593
Endometrial thickness (mm) 10.64 ± 2.38 10.77 ± 1.96 0.755
Transferred embryos 2.4 ± 0.53 2.1 ± 0.59 <0.001

MII: Metaphase II