Objective:
To evaluate the contribution of serious mental illness (SMI), and
specific risk factors (comorbidities and substance use) to the risk of
adverse birth outcomes.
Study design:
This cross-sectional study uses maternal delivery records in the
Healthcare Cost and Utilization Project Nationwide/National Inpatient Sample
(HCUP-NIS) to estimate risk factor prevalence and relative risk of adverse
birth outcomes (e.g. preeclampsia, preterm birth, and fetal distress) in
women with SMI.
Results:
The relative risk of adverse gestational (1.15, 95% CI: 1.13-1.17),
obstetric (1.07, 1.06-1.08) and fetal (1.24, 1.21-1.26) outcomes is
increased for women with SMI. After adjusting for risk factors the risk is
significantly reduced, but remains elevated for all three adverse outcome
categories (gestational: 1.08, 1.06-1.09; obstetric: 1.03, 1.02-1.05; fetal:
1.12, 1.09-1.14).
Conclusions:
Maternal serious mental illness is independently associated with
increased risk for adverse birth outcomes. However, approximately half of
the excess risk is attributable to comorbidities and substance use.