Table 1.
Baseline characteristics and clinical outcomes of women undergoing fresh or freeze-all strategy in r-ICSI cycles
| Group 1 | Group 2 | P | |
|---|---|---|---|
| Fresh embryo transfer (N = 926) | Freeze-all-embryos (N = 365) | ||
| Maternal age at oocyte retrieval (IQR) — yr | 33.00 (30.00–37.00) | 31.00 (29.00–35.00) | < 0.001 |
| Maternal BMI (IQR) —kg·m 2 | 22.32 (20.20-24.65) | 21.88 (20.20-24.01) | 0.260 |
| Infertile years (IQR) — yr | 5.00 (3.00–8.00) | 3.00 (2.00–6.00) | < 0.001 |
| Gravidity—no./total no. (%) | < 0.001 | ||
| 0 | 562/926 (60.69) | 260/365 (71.23) | |
| 1 | 192/926 (20.73) | 70/365 (19.18) | |
| 2 | 117/926 (12.63) | 22/365 (6.03) | |
| ≥ 3 | 90/926 (9.72) | 13/365 (3.56) | |
| FSH(IQR) —mIU/mL | 7.10 (5.71–8.69) | 6.61 (5.25–7.95) | < 0.001 |
| E2(IQR) —pg/mL | 148.00 (113.50-197.50) | 159.00 (121.00-210.00) | 0.766 |
| PRL(IQR) —nmol/L | 12.40 (8.88–17.60) | 12.03 (9.16–16.70) | 0.802 |
| LH(IQR) —mIU/mL | 3.50 (2.48–5.01) | 3.90 (2.65–5.29) | 0.733 |
| Gonadotropin dose(IQR)—IU | 2850.00 (1950.00-4125.00) | 2325.00 (1800.00-3150.00) | < 0.001 |
| Lg (Gn) | 3.35 (3.21–3.49) | 3.45 (3.29–3.60) | < 0.001 |
| Number of oocytes retrieval(IQR) | 10.00 (6.00–15.00) | 13.00 (9.00–19.00) | < 0.001 |
| Number of oocytes used for r-ICSI | 8.00 (5.00–12.00) | 10.00 (7.00–14.00) | < 0.001 |
| r-ICSI 2PN fertilization | 0.50 (0.25–0.71) | 0.54 (0.33–0.72) | 0.028 |
| r-ICSI cleavage embryos | 6.00 (3.75-9.00) | 8.00 (6.00–11.00) | < 0.001 |
| positive hCG—no./total no. (%) | 101/926 (10.91) | 200/365 (54.79) | < 0.001 |
| Clinical pregnancy—no./total no. (%) | 61/926 (6.59) | 173/365 (47.39) | < 0.001 |
| IR—no./total no. (%) | 76/1971 (3.86) | 184/433 (42.49) | < 0.001 |
| MR—no./total no. (%) | 18/61 (29.51) | 36/173 (20.81) | 0.166 |
| LBR—no./total no. (%) | 43/926(4.64) | 137/365 (37.53) | < 0.001 |
| Newborns (N) | 50 | 146 | - |
| Cumulative clinical pregnancy—no./total no. (%) | 76/926 (8.21) | 192/365 (52.60) | < 0.001 |
| cLBR—no./total no. (%) | 57/926 (6.16) | 158/365 (43.29) | < 0.001 |
Note: IR = implantation rate; MR = miscarriage rate; LBR = live birth rate; cLBR = cumulative live birth rate