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Table 2 Patient characteristics for blastocyst and cleavage-stage transfer: Jan 2009 ~ Jul 2010 (age between 35 to 39 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 52 21
Female patient age (y, mean± SD) 36.69±1.45 37.05±1.32
Duration of infertility (y, mean± SD) 5.85±3.31 6.45±3.20
Body mass index (w, mean± SD) 22.14±2.07 22.84±2.47
ICSI cycles, no. of patients (%) 12(23.1) 5(23.8)
Tubal factor, no. of patients (%) 33(63.5) 10(47.6)
Male factor, no. of patients (%) 4(7.7) 4(19.0)
Tubal and male factor, no of patients (%) 13(25) 5(23.8)
Multiple factors, no. of patients (%) 2(3.8) 2(9.5)
  1. Note: Values are presented as number, number (%) or mean ± SD.
  2. ICSI: intracytoplasmic sperm injection.
  3. Female patient age, duration of infertility, body mass index, percentage of ICSI cycles and percentage of different infertility factors were all not significantly different between the cleavage-stage and blastocyst transfer groups.