Results
From 2014 to 2015, 789,482 women delivered in Korea. After excluding
women with missing data (n = 515), 788,967 remaining women were
included in dataset 1. Among them, 740,675 (93.88%) women had no
diagnosed myoma, 38,402 (4.88%) had diagnosed myoma(s) but no history
of myomectomy, and 9,890 (1.25%) women had a history of myomectomy
before pregnancy. Dataset 2 included 534,259 women, excluding women
whose infants did not receive infant screening (n = 254,693) or
showed missing values (n = 15). There were 502,209 (94.00%)
women who had never been diagnosed with myoma, 25,408 (4.76%) women who
had diagnosed myoma(s) but no history of myomectomy, and 6,642 (1.24%)
women who had a history of myomectomy, in dataset 2.
Maternal characteristics and adverse pregnancy outcomes of the study
population in dataset 1 as described in Table 1. There were significant
differences in maternal age, rates of nulliparity, multiple pregnancy,
cesarean section, and complications of preeclampsia, postpartum
hemorrhage, placenta previa, and uterine rupture, between the groups.
However, there was no significant difference in placental abruption
between the three groups.
Obstetric characteristics in dataset 2 are presented in Table 2. There
were significant differences in neonatal birth weight and sex, and rates
of preterm birth, LBW, and LGA.