Purpose
This study examined associations among maternal depression, measured in several ways, psychiatric medication use in pregnancy, and preterm delivery (PTD).
Methods
Data were from 3,019 women enrolled in the Pregnancy Outcomes and Community Health Study (1998–2004), a prospective study of pregnant women in five Michigan communities. Information on depressive symptoms, history of depression and psychiatric medication use was ascertained through interviews at mid-pregnancy. These variables and other relevant covariates were incorporated into regression models with a binary outcome, i.e., term (≥ 37 weeks’ gestation) as referent and PTD (< 37 weeks’ gestation). A second set of models used a multi-category outcome, i.e., term as referent and PTD further subdivided by gestational weeks and clinical circumstances.
Main Findings
The odds of overall PTD was increased among women who used psychiatric medication during pregnancy and had either elevated levels of depressive symptoms at mid-pregnancy (adjusted odds ratio [AOR] = 2.0 [95% CI 1.1, 3.6]) or a history of depression prior to pregnancy (AOR= 1.6 [95% CI 1.1, 2.5]). The combination of psychiatric medication use in pregnancy and depression, prior to pregnancy or within pregnancy, was most strongly linked to a medically indicated delivery at < 35 weeks’ gestation (AOR 2.9 and 3.6 respectively).
Conclusions
There are at least two plausible explanations for these findings. First, psychiatric medication use in pregnancy may pose an excess risk of PTD. Second, medication use may be an indicator of depressive symptom severity, which is a direct or indirect (i.e., alters behavior) contributing factor to PTD.