Table 1.
Demographic and treatment characteristics of patients with single frozen-thawed embryo transfer.
| Good quality embryo on day 3 | Poor quality embryo on day 3 | Good quality embryo on day 5 | Poor quality embryo on day 5 | Good quality embryo on day 6 | Poor quality embryo on day 6 | |
|---|---|---|---|---|---|---|
| Number of FET cycles | 3597 | 261 | 518 | 120 | 926 | 655 |
| Maternal age(years), mean ± SD | 33.86 ± 5.35 | 35.04 ± 5.91 | 31.84 ± 4.19 | 32.41 ± 4.47 | 32.31 ± 4.50 | 33.09 ± 4.74 |
| Maternal BMI(kg/m2), mean ± SD | 21.88 ± 3.04 | 21.94 ± 2.88 | 21.53 ± 2.72 | 21.30 ± 2.63 | 21.58 ± 2.92 | 21.48 ± 2.84 |
| Type of infertility, n(%) | ||||||
| Primary infertility | 1888(52.49) | 130(49.81) | 277(53.47) | 59(49.17) | 512(55.29) | 332(50.69) |
| Second infertility | 1709(47.51) | 131(50.19) | 241(46.53) | 61(50.83) | 414(44.71) | 323(49.31) |
| Parity, n(%) | ||||||
| Nulliparous | 3035(84.38) | 206(78.93) | 466(89.96) | 102(85.00) | 832(89.85) | 572(87.33) |
| Pluriparous | 562(15.62) | 55(21.07) | 52(10.04) | 18(15.00) | 94(10.15) | 83(12.67) |
| Infertility causes, n(%) | ||||||
| Female | 2182(60.66) | 143(54.79) | 322(62.16) | 83(69.17) | 562(60.69) | 403(61.53) |
| Male | 339(9.42) | 24(9.20) | 50(9.65) | 7(5.83) | 86(9.29) | 57(8.70) |
| Mixed | 757(21.05) | 55(21.07) | 110(21.24) | 23(19.17) | 191(20.63) | 136(20.76) |
| Unexplained | 319(8.87) | 39(14.94) | 36(6.95) | 7(5.83) | 87(9.40) | 59(9.01) |
| FET cycles rank | ||||||
| 1 | 2235(62.14) | 148(56.70) | 260(50.19) | 40(33.33) | 462(49.89) | 282(43.05) |
| 2 | 917(25.49) | 71(27.20) | 153(29.54) | 48(40.00) | 293(31.64) | 231(35.27) |
| ≥3 | 445(12.37) | 42(16.09) | 105(20.27) | 32(26.67) | 171(18.47) | 142(21.68) |
| Intracytoplasmic sperm injection fertilization, n(%) | ||||||
| Yes | 2314(64.33) | 167(63.98) | 337(65.06) | 82(68.33) | 620(66.95) | 423(64.58) |
| No | 1283(35.67) | 94(36.02) | 181(34.94) | 38(31.67) | 306(33.05) | 232(35.42) |
| Endometrial preparation program, n(%) | ||||||
| Natural cycle | 788(21.91) | 54(20.69) | 119(22.97) | 26(21.67) | 233(25.16) | 147(22.44) |
| Mild Stimulation cycle | 1419(39.45) | 95(36.40) | 231(44.59) | 51(42.50) | 423(45.68) | 278(42.44) |
| Hormonal replacement cycle | 1390(38.64) | 112(42.91) | 168(32.43) | 43(35.83) | 270(29.16) | 230(35.11) |