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

Table 1 Patient characteristics for blastocyst and cleavage-stage transfer: Jan 2009 ~ Jul 2010 (age < 35 years)

	Cleavage-stage transfer group	Blastocyst transfer group
Number of patients	310	168
Female patient age (y, mean± SD)	29.61±3.03	28.87±2.70^a
Duration of infertility (y, mean± SD)	3.90±1.88	3.92±1.90
Body mass index (w, mean± SD)	21.88±2.54	21.84±2.24
ICSI cycle, no. of patients (%)	90( 29.0)	45(26.8)
Tubal factor, no. of patients (%)	151( 48.7)	83(49.4)
Male factor, no. of patients (%)	43(13.9 )	23(13.7)
Tubal and male factor, no. of patients (%)	89( 28.7)	52(31.0)
Multiple factors, no. of patients (%)	27( 8.7)	10(6.0)

Note: Values are presented as number, number (%) or mean ± SD.
ICSI: intracytoplasmic sperm injection.
Duration of infertility, body mass index, percentage of ICSI cycles and percentage of different infertility factor were all not significantly different between cleavage-stage and blastocyst transfer group.
a:significant difference between the cleavage-stage and blastocyst transfer groups (P<0.05) .

ISSN: 1757-2215