Table 1 The demographic and main treatment characteristics for woman with singleton deliveries
Programmed cycles | Natural cycles | Minimal ovarian stimulation cycles | P value | |
|---|---|---|---|---|
n = 2,029 | n = 959 | n = 470 | ||
Maternal age (year)ab | 31.66 ± 3.90 | 32.68 ± 3.84 | 31.62 ± 3.77 | < 0.001c |
Maternal age, n (%)ab | ||||
< 38 | 1866 (92.0) | 854 (89.1) | 438 (93.2) | 0.009d |
≥ 38 | 163 (8.0) | 105 (10.9) | 32 (6.8) | |
Maternal BMI (kg/m2)ab | 22.09 ± 3.51 | 21.30 ± 2.74 | 22.17 ± 3.21 | < 0.001c |
Maternal BMI, n (%)ab | ||||
< 28 | 1914 (94.3) | 935 (97.5) | 445 (94.7) | < 0.001d |
≥ 28 | 115 (5.7) | 24 (2.5) | 25 (5.3) | |
Menstrual Cycleabe | ||||
Regular | 1508 (74.3) | 935 (97.5) | 388 (82.6) | < 0.001d |
Irregular | 521 (25.7) | 24 (2.5) | 82 (17.4) | |
Maternal smoking, n (%) | ||||
No smoking | 2027 (99.9) | 956 (99.7) | 469 (99.8) | NSf |
Smoking | 2 (0.1) | 3 (0.3) | 1 (0.2) | |
Duration of infertility (years) | 3.14 ± 2.30 | 3.09 ± 2.19 | 3.12 ± 2.28 | NSc |
Parity, n (%) | ||||
First | 1902 (93.7) | 885 (92.3) | 437 (93.0) | NSd |
High order | 127 (6.3) | 74 (7.7) | 33 (7.0) | |
Cause of infertility, n (%) | ||||
Tubal factor | 1007 (49.6) | 496 (51.7) | 265 (56.4) | NSd |
Male factor | 455 (22.4) | 217 (22.6) | 84 (17.9) | |
Unexplained infertility | 139 (6.9) | 71 (7.4) | 32 (6.8) | |
Multiple factors | 344 (17.0) | 130 (13.6) | 74 (15.7) | |
Others | 84 (4.1) | 45 (4.7) | 15 (3.2) | |
ART method, n (%) | ||||
IVF | 1276 (62.9) | 608 (63.4) | 279 (59.4) | NSd |
ICSI | 753 (37.1) | 351 (36.6) | 191 (40.6) | |
Culture duration, n (%) | ||||
Cleavage-stage embryo | 1565 (77.1) | 752 (78.4) | 370 (78.7) | NSd |
Blastocyst embryo | 464 (22.9) | 207 (21.6) | 100 (21.3) | |
Proportion of high-quality embryos, n (%) | 2225 (68.0) | 1058 (68.4) | 512 (69.1) | NSd |
No. of transferred embryos, n (%) | ||||
1 | 784 (38.6) | 372 (38.8) | 199 (42.3) | NSd |
2 | 1245 (61.4) | 587 (61.2) | 271 (57.7) | |
Endometrial thickness on transfer day(mm)ae | 9.77 ± 1.82 | 10.12 ± 1.98 | 10.26 ± 2.42 | < 0.001c |
Gestational weeks (week)b | 38.48 ± 1.76 | 38.56 ± 1.44 | 38.32 ± 1.60 | 0.029c |
Birthweight(g)e | 3350.81 ± 519.22 | 3310.11 ± 468.51 | 3251.92 ± 504.79 | < 0.001c |