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Table 1 Characteristics of studies included in the meta-analysis

From: Which one has a better obstetric and perinatal outcome in singleton pregnancy, IVF/ICSI or FET?: a systematic review and meta-analysis

Study Area/duration Type of study Population Embryo transferred Freezing techniques FET protocol Measurements assessed
Fresh ET FET
1994 Wada UK
1985–1991
Retro IVF vs. FET D2/D3 embryos Cleavage embryos/blastocysts Slow freezing Natural/HRT cycles Preterm birth
LBW
Still birth
2005 Wang Australia
1996–2000
Retro IVF/ICSI/GIFT vs. FET Not mentioned Not mentioned Not mentioned Not mentioned Preterm birth
LBW
2008 Belva Belgium
1983–2006
Retro IVF/ICSI vs. FET D1,2,3,5 embryo D1/2/3/5 embryo A slow controlled-rate freezing procedure Natural cycles/stimulated cycles Preterm birth
LBW
2008 Shih Australia
1978–2005
Retro IVF/ICSI/GIFT vs. FET D2/D3 embryo D2/D3 embryo No specific description Natural/artificial cycles Preterm birth
LBW
Perinatal mortality
Cesarean section
2010 Aflatoonian Iran
2006–2008
Retro IVF/ICSI vs. FET D2/D3 embryo D2/D3 embryo Vitrification Artificial cycles Preterm birth
LBW
2010 Pelkonen Finland
1995–2006
Cohort study IVF/ICSI vs. FET D2/D3 embryo D2/D3 embryo Slow freezing Natural/artificial cycles Preterm birth
LBW
Still birth
Perinatal mortality
Cesarean section
2010 Pinborg Denmark
1995–2007
Cohort study IVF/ICSI vs. FET D2/D3 embryo D2/D3 embryo Slow freezing Not mentioned Preterm birth
LBW
Still birth
Perinatal mortality
Cesarean section
2010 Wikland Sweden
2006–2008
Cohort study IVF/ICSI vs. FET blastocysts D2/D3 embryo/blastocysts Vitrification/slow-freezing Natural/artificial/stimulated cycles Preterm birth
LBW
Perinatal mortality
Cesarean section
2011 Henningsen Denmark
1994–2006
Cohort study IVF/ICSI vs. FET D2 embryo D2 embryo Slow-freezing Not mentioned LBW
2012 Kalra United States
2004–2006
Cohort study IVF vs. FET Not mentioned Not mentioned Not mentioned Not mentioned Preterm birth
LBW
2012 Kato Tokyo
2006–2008
Retro IVF/ICSI vs. FET Cleavage stage embryo/blastocyst Cleavage stage embryo/ blastocyst Vitrification Natural/artificial cycles Preterm birth
LBW
Still birth
Perinatal mortality
2013 Wennerholm Denmark
−2007
Retro IVF/ICSI vs. FET D2 embryo D2 embryo Slow-freezing Not mentioned Preterm birth
LBW
Still birth
Perinatal mortality
Cesarean section
2015 Kemal Antalya
2012–2012
Retro IVF vs. FET Blastocyst Blastocyst Vitrification Artificial cycles Still birth
  1. Abbreviation: Retro retrospective