Risk of Preterm Birth and Newborn Low Birthweight in Military Women with Increased Pregnancy-Specific Anxiety

Prenatal maternal anxiety and depression have been implicated as possible risk factors for preterm birth (PTB) and other poor birth outcomes. Within the military, maternal conditions account for 15.3% of all hospital bed days, and it is the most common diagnostic code for active duty females after mental disorders. The majority of women (97.6%) serving on active duty are women of childbearing potential. Understanding the impact that prenatal maternal anxiety and depression can have on PTB and low birthweight (LBW) in a military population is critical to providing insight into biological pathways that alter fetal development and growth. The purpose of the study was to determine the impact of pregnancy-specific anxiety and depression on PTB and LBW within a military population.

Pregnancy-specific anxiety and depression were measured for 246 pregnant women in each trimester. Individual slopes for seven different measures of pregnancy anxiety and one depression scale were calculated using linear mixed models. Logistic regression, adjusted and unadjusted models, were applied to determine the impact on PTB and LBW.

For each 1/10 unit increase in the anxiety slope as it related to well-being, the risk of LBW increased by 83% after controlling for parity, PTB, and active duty status. Similarly, a 1/10 unit rise in the anxiety slope related to accepting pregnancy, labor fears, and helplessness increased the risk of PTB by 37%, 60%, and 54%, respectively.

Pregnancy-specific anxiety was found to significantly increase the risk of PTB and LBW in a military population. Understanding this relationship is essential in developing effective assessments and interventions. Results emphasize the importance of prenatal maternal mental health to fetal health and birth outcomes. Further research is needed to determine the specific physiological pathways that link prenatal anxiety and depression with poor birth outcomes.