Is there an association between maternal anxiety propensity and pregnancy outcomes?

BACKGROUND: Several studies have shown inconsistent associations between anxiety during pregnancy and adverse pregnancy outcome. This inconsistency may be due to lack of controlling for the timing and type of maternal anxiety. We aimed to isolate a specific type of anxiety - maternal anxiety propensity, which is not directly related to pregnancy, and evaluate its association with adverse pregnancy outcome. METHODS: We conducted a prospective observational study of 512 pregnant women, followed to delivery. The trait anxiety scale of the State-Trait Anxiety Inventories was used in order to detect a propensity towards anxiety. The association between anxiety propensity (defined as trait-anxiety subscale score above 38) and adverse pregnancy outcome was evaluated. Primary outcome was a composite outcome including preterm birth prior to 37 gestational weeks, hypertensive disorders in pregnancy, small for gestational age newborn and gestational diabetes mellitus. Secondary outcomes were each one of the above mentioned gestational complications. RESULTS: There were no significant between-group differences in adverse pregnancy outcomes, including the rate of preterm birth, hypertensive disorders, small for gestational age, gestational diabetes or a composite outcome of them all. CONCLUSION: Anxiety propensity is not associated with adverse pregnancy outcome. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s12884-018-1925-8) contains supplementary material, which is available to authorized users.