Severe maternal morbidity in deaf or hard of hearing women in the United States

Prior studies on severe maternal morbidity (SMM) have often excluded women who are deaf or hard of hearing (DHH), even though they are at increased risk of pregnancy complications and adverse birth outcomes. This study compared rates of SMM during delivery and postpartum among DHH and non-DHH women. This nationally representative retrospective cohort study used hospital discharge data from the 2004–2020 Health Care and Cost Utilization Project Nationwide Inpatient Sample. The risk of SMM with and without blood transfusion during delivery and postpartum among DHH and non-DHH women were compared using modified Poisson regression analysis. The study was conducted in the United States in 2022–2023. The cohort included 9351 births to DHH women for the study period, and 13,574,382 age-matched and delivery year-matched births to non-DHH women in a 1:3 case-control ratio. The main outcomes were SMM and non-transfusion SMM during delivery and postpartum. Relative risks were sequentially adjusted for sociodemographic characteristics, hospital-level characteristics, and clinical characteristics. In unadjusted analyses, DHH women were at 80% higher risk for SMM (RR = 1.81, 95% CI 1.63–2.02, p