Pregnancy outcome following minor trauma during third trimester of pregnancy in Primiparous women: A propensity score-matched cohort study.

OBJECTIVE: To determine the impact of minor trauma during pregnancy on adverse pregnancy outcome in primiparous women. METHODS: A retrospective cohort study was conducted at a single, tertiary university-affiliated medical center between 2012 and 2023. Primiparous women aged 18 to 45 years who experienced minor trauma (Injury Severity Score ≤ 9) during pregnancy after 28 + 0 weeks of gestation and subsequently delivered at our institution were included. Outcomes were compared with those of women without trauma using 1:1 propensity score matching. Outcomes included preterm delivery, cesarean delivery under general anesthesia, placental abruption, and need for blood transfusion. RESULTS: Of 59 774 primiparous deliveries, 852 (1.4%) experienced minor trauma during pregnancy. After propensity score matching (727 pairs), no individual adverse outcome showed a clinically significant difference between the study and control groups (all standardized mean differences < 0.2). Findings were consistent among subgroups defined by mechanism of injury, gestational age at trauma, and propensity score stratum, and in a multiparous sensitivity analysis. CONCLUSION: Minor trauma during the third trimester of pregnancy in primiparous women was not associated with a clinically significant increase in adverse maternal and perinatal outcomes in this matched cohort. These findings may help reassure patients and clinicians following minor traumatic events during pregnancy, although appropriate clinical evaluation and monitoring remain warranted.