Table 1

Population characteristics

No fibroids
group 1
(reference group)
Fibroids before pregnancy
no operation
group 2
Fibroids after pregnancy
group 3
Fibroid operation before pregnancy
group 4
Population, N91 292124963317
Age, years
Mean (SD)
30 (4.29)34 (4.15)32 (3.96)34 (4.16)
BMI, kg/m2
median (range)
23 (10–64)23 (16–40)23 (16–49)22 (18–35)
Parity median (range)1 (0–14)1 (0–3)1 (0–5)0 (0–3)
Smoking, %16.4311.8216.0413.15
Fertility treatment, %6.3218.489.7639.39
Multiple pregnancy, %2.144.033.957.89