| Study (RCTs) | Women (FET/Fresh-ET) |
Age, years (FET/Fresh-ET) | Mean number of oocytes retrieved (FET/Fresh-ET) |
Day of embryo transfer | Outcomes measured |
| Shapiro 2011a | 122 (60/62) | 30.6/31.4 | 20.9/19.3 | Day 5 | Implantation Clinical pregnancy Ongoing pregnancy Miscarriage |
| Shapiro 2011b | 137 (70/67) | 33.0/32.9 | 12.9/14.1 | Day 5 | Implantation Clinical pregnancy Ongoing pregnancy Miscarriage |
| Chen 2016 | 1508 (746/762) | 28.1/28.2 | 14.4/14.2 | Day 2 Day 3 Day 5 |
Biochemical pregnancy Clinical pregnancy Ongoing pregnancy Miscarriage Live births |
| Vuong 2016 | 782 (391/391) | 31.8/32.1 | 12.6/12.9 | Day 3 | Ongoing pregnancy Live birth |
| Coates 2017 | 179 (91/88) | 36.6/36.7 | 14.0/17.0 | Day 6 (PGS) | Implantation Ongoing pregnancy Live birth |