Main Findings
The principal findings of this study are as follows: (1) In the study population (dataset 2), 25,408 (4.76%) women had a history of diagnosed myoma(s) but no myomectomy, and 6,642 (1.24%) women received myomectomy before pregnancy.; (2) Women who have had a myomectomy had significantly higher risks of cesarean section, placenta previa, preterm birth, LBW, and uterine rupture, but a lower risk of LGA, than did women without a history of diagnosed myoma.; (3) The incidence of uterine rupture was significantly higher at delivery within one year after myomectomy (0.71%) than during any longer delivery interval after myomectomy.; (4) Women with a history of diagnosed myoma had significantly higher risks of cesarean section and placenta previa, but no significantly increased risks of preterm birth, LBW, or uterine rupture, compared to women without a history of diagnosed myoma.