BACKGROUND: Evidence suggests that maternal anxiety is associated with adverse pregnancy and delivery outcomes, such as preterm birth, vaginal bleedings and low birth weight.

AIMS: To examine the association of lifetime anxiety disorders and pregnancy-related anxiety and complications during pregnancy and delivery.

STUDY DESIGN: Prospective-longitudinal study (MARI).

SUBJECTS: N = 306 pregnant women who were investigated repeatedly during the peripartum period.

OUTCOME MEASURES: Information on lifetime anxiety disorders was assessed using a dimensional score (lifetime anxiety liability index) based on the standardized Composite International Diagnostic Interview for Women (CIDI-V). Pregnancy-related anxiety was surveyed with the Pregnancy and Childbirth Related Fears (PCF) questionnaire. Common pregnancy (e.g. vaginal bleedings) and delivery complications (e.g. labor induction) were assessed via medical records, interviews and questionnaires.

RESULTS: The global tests on the association between lifetime anxiety liability and pregnancy complications and on the association between pregnancy-related anxiety and pregnancy/delivery complications revealed significant associations. Further analyses revealed associations of lifetime anxiety liability with preterm labor (OR = 1.6, 95% CI = 1.2-2.0) as well as pregnancy-related anxiety with vaginal bleedings (OR = 1.4, 95% CI = 1.0-1.8), preterm labor (OR = 1.3, 95% CI = 1.0-1.7), gestational diabetes (OR 0.5, 95% CI = 0.2-0.9), labor induction (OR = 1.5, 95% CI = 1.1-1.9) and use of labor medication (OR = 1.6, 95% CI = 1.2-2.0). After adjustment for maternal age, maternal body mass index, maternal smoking, socioeconomic status (occupation, household income) and social support (cohabitation), the associations between pregnancy-related anxiety and labor induction as well as use of labor medication remained significant.

CONCLUSIONS: Pregnancy-related anxiety should be regularly assessed and, if necessary, treated during (early) pregnancy to minimize risks for complications during delivery.