Clinical outcome of fresh and vitrified-warmed blastocyst and cleavage-stage embryo transfers in ethnic Chinese ART patients

Table 4 Clinical outcome after vitrified blastocyst and cleavage-stage transfer (age <35 years)

	Cleavage-stage transfer		Blastocyst Transfer
	Fresh group	Vitrified group ^C	Fresh group	Vitrified group
No. of patients	274	36	168	118
No. of embryos transferred (mean± SD)	2.15±0.55	2.19±0.40	1.82±0.38	1.69±0.58^a
Clinical pregnancy rate, no. (%)	129/274 (47.8)	18/36 (50.0)	69/168 (41.7)	67/118 (56.8)^b
Implantation rate, no. (%)	184/589 (31.2)	27/79 (34.2)	97/305 (31.8)	94/200 (47.0)^b
Mutiple pregnancy rate, no. (%)	53/129 (41.1)	9/18 (50.0)	28/69 (40.6)	26/67 (37.3)
Singleton pregnancy rate, no.	76	9	41	41
Twin pregnancy rate, no.	51	9	27	25
Triplets pregnancy rate, no.	2	0	1	1

Note:values are presented as number, number (%) or mean ± SD.
a:significant difference between cleavage-stage transfer and blastocyst transfer in vitrified group (p<0.01).
b:significant difference between fresh group and vitrified group in blastocyst transfer (p<0.05).
C: patients without transfer in fresh cycles.

ISSN: 1757-2215