Table III.
Baseline characteristics.
| Parameter | Caesarean section n = 334 | Vaginal delivery n = 983 | P value |
|---|---|---|---|
| Age (years) | 36.6 ± 3.6 | 36.2 ± 3.8 | .051 |
| BMI kg/m2 | 24.9 ± 10.1 | 24.2 ± 4.4 | .251 |
| Smoking, n (%) | 49/305 (16.1) | 119/907 (13.1) | .198 |
| Alcohol use, n (%) | 161/304 (53.0) | 471/906 (52.0) | .769 |
| Duration of subfertility (years) | 2.7 ± 1.9 | 2.9 ± 2.2 | .145 |
| Current fertility treatment, n (%) | .003 | ||
| - IVF | 211 (63.2) | 528 (53.7) | |
| - ICSI | 123 (36.8) | 455 (46.3) | |
| Previous fertility treatment, n (%) | .834 | ||
| - None (spontaneous/OI) | 150/323 (46.4) | 441/936 (47.1) | |
| - IVF/ICSI/IUI | 173/323 (53.6) | 495/936 (52.9) | |
| Reason for fertility treatment, n (%) | |||
| - Tubal factor | 55 (16.5) | 122 (12.4) | .060 |
| - Male factor | 106 (31.7) | 408 (41.5) | .002 |
| - Endometriosis | 51 (15.3) | 107 (10.9) | .033 |
| - Other | 122 (36.5) | 346 (35.2) | .661 |
| Uterus factors, n (%) | |||
| - DES exposure | 3 (0.9) | 3 (0.3) | .221 |
| - Fibroids | 15 (4.5) | 37 (3.8) | |
| - Congenital/structural abnormalitiesa | 12 (3.6) | 10 (1.0) | |
| - Adenomyosis | 4 (1.2) | 11 (1.1) | |
| - Asherman syndrome | 3 (0.9) | 4 (0.4) | |
| Endometrium thickness on OPU (mm) | 11.9 ± 12.9 | 11.7 ± 10.7 | .715 |
| Number of follicles ≥14 | 8.1 ± 5.2 | 8.6 ± 5.5 | .152 |
| Total number of oocytes retrieved | 9.8 ± 6.0 | 10.6 ± 6.5 | .071 |
| Number of embryos transferred, n (%) | .018 | ||
| - 0 | 44 (13.2) | 81 (8.2) | |
| - 1 | 253 (75.7) | 765 (77.8) | |
| - 2 | 37 (11.1) | 137 (13.9) | |
| Embryo qualityb, n (%) | .447 | ||
| - 1 | 110/286 (38.5) | 374/893 (41.9) | |
| - 2 | 134/286 (46.9) | 409/893 (45.8) | |
| - 3 | 42/286 (14.7) | 110/893 (12.3) | |
| Fertilisation rate (IVF) | 63.5 ± 22.6 | 68.4 ± 19.8 | .010 |
| Fertilisation rate (ICSI) | 71.0 ± 20.0 | 70.8 ± 18.5 | .923 |
| Amniotic sacs, n (%) | |||
| - 0 | 248 (74.3) | 651 (66.2) | .007 |
| - 1 | 79 (23.7) | 213 (31.7) | .005 |
| - 2 | 7 (2.1) | 20 (2.0) |
Data are mean ± SD unless stated otherwise.
a
aStructural abnormalities e.g.: uterus bicornis/unicornis/didelphys/arcuatus/duplex/septum. bSee Table VI.
OI, ovulation induction; DES, diethyl stilbesterol.