Total cohort (n = 5330) | Uncomplicated (n = 4188) | Pre-pregnancy complications (n = 1142) | |||||
---|---|---|---|---|---|---|---|
n | % | n | % | n | % | ||
Number of previous early miscarriages | 0 | 3672 | 68.9 | 3100 | 74.0 | 572 | 50.1 |
1–2 | 1438 | 27.0 | 1088 | 26.0 | 350 | 30.6 | |
≥ 3 | 220 | 4.1 | 0 | 0.0 | 220 | 19.3 | |
Previous late miscarriages (after week 16) or IUFD | Yes | 96 | 1.8 | 0 | 0.0 | 96 | 8.4 |
No | 5234 | 98.2 | 4188 | 100.0 | 1046 | 91.6 | |
Method of conception | Uncomplicated | 4850 | 91.0 | 4187 | 100.0 | 663 | 58.1 |
In vitro fertilization (IVF) | 307 | 5.8 | 2 | 0.0 | 305 | 26.7 | |
Intracytoplasmic sperm injection (ICSI) | 98 | 1.8 | 2 | 0.0 | 96 | 8.4 | |
Insemination | 53 | 1.0 | 3 | 0.1 | 50 | 4.4 | |
Medically or surgically assisted | 138 | 2.6 | 23 | 0.5 | 100 | 8.8 | |
Time to pregnancy | < 6 months | 3835 | 72.0 | 3601 | 86.0 | 234 | 20.5 |
6–12 months | 642 | 12.0 | 536 | 12.8 | 106 | 9.3 | |
>= 12 months | 790 | 14.8 | 0 | 0.0 | 790 | 69.2 | |
Missing | 63 | 1.2 | 51 | 1.2 | 12 | 1.1 |