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

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

  Cleavage-stage transfer group Blastocyst transfer group
Number of patients 310 168
Female patient age (y, mean± SD) 29.61±3.03 28.87±2.70a
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)
  1. Note: Values are presented as number, number (%) or mean ± SD.
  2. ICSI: intracytoplasmic sperm injection.
  3. 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.
  4. a:significant difference between the cleavage-stage and blastocyst transfer groups (P<0.05) .