Happy Mother - Healthy Baby: Supplement Study on Biological Processes Underlying Anxiety During Pregnancy

This study will leverage the ongoing randomized evaluation of the CBT anxiety prevention intervention in Pakistan (R01-MH111859) to explore potential biological mechanisms. This CBT intervention targets both sub-threshold anxiety symptoms and generalized anxiety disorder (GAD) in early- to mid- pregnancy, aiming to both prevent and treat Common Mental Disorders (CMDs) (GAD and major depressive episodes (MDE)) as well as improve birth outcomes. The study team proposes to additionally study biological correlates of antenatal anxiety (i.e., immune and endocrine functioning) in 300 women: in addition to 200 drawn from our randomized trial (100 intervention, 100 usual care), the study will also include 100 healthy women without anxiety or depression. The aims are to 1) characterize the "immune phenotype" of anxious women across the peripartum, specifically by measuring the relation among anxiety symptoms and peripheral markers of inflammation within and across women (both anxious and healthy) and between those receiving the intervention and control; 2) determine the relation between levels of allopregnanolone (ALLO) in pregnancy and concurrent anxiety symptoms and future symptoms of postpartum depression (PPD), 3) examine the relation between changes in immune functioning and ALLO levels in anxious pregnancy across time, 4) examine whether immune function and/or ALLO are mediators or moderators of the association between antenatal anxiety and preterm birth and/or small-for-gestational age, and 5) examine the effects of both anxiety and the intervention (including biomarkers) on infant development at six weeks postpartum.