Subject characteristics (faecal samples)
| Pregnant IBD patients (n=46) | Pregnant controls (n=179) | P value | |
| Mean age at conception in years (SD) | 29.7 (3.1) | 31 (4.1) | 0.055 |
| Antibiotic use during pregnancy (%) | 3 (6.5) | 0 | <0.0001 |
| Nulliparous (%) | 37 (80.4) | 86 (38.4) | <0.0001 |
| Use of assisted reproductive technology (%) | 7 (15.2) | 6 (2.7) | <0.0001 |
| Delivery (%) | 0.259 | ||
| Vaginal delivery | 37 (84.1) | 180 (81.4) | |
| Caesarean section | 7 (15.9) | 41 (18.6) | |
| Birth outcome (%) | |||
| Live birth | 44 (95.7) | 221 (98.7) | 0.168 |
| Stillbirth | 2 (4.3) | 0 (0) | <0.0001 |
| Termination | 0 (0) | 3 (1.3) | <0.0001 |