title: What causes pregnancy loss? Preexisting mental illness as an independent risk factor.
abstract: OBJECTIVE
  Maternal mental health disorders in pregnancy are common and are associated with prematurity, low birth weight and delivery complications. We explored whether existing mental illness was associated not just with fetal complications but also with fetal death.
  
  
  METHODS
  We conducted a retrospective cohort analysis using data from the National Comorbidity Survey (NCS). The NCS is a nationally representative multistage probability study of the prevalence of psychiatric disorders in the United States. We analyzed the association between a prepregnancy mental health diagnosis and subsequent miscarriage or stillbirth, using multivariable logistic regression to control for maternal age, race, health risks and other independent risk factors for fetal death.
  
  
  RESULTS
  Patients with any mental health disorder prior to pregnancy [odds ratio (OR)=1.8], specifically those with affective disorders (OR=1.6) or substance use disorders (OR=1.4), were at significantly higher risk for fetal mortality in pregnancy. This risk remained significant even when controlling for health and behavioral risk factors that cause fetal loss.
  
  
  CONCLUSIONS
  These results are consistent with studies showing mental health to be independently associated with morbidity and mortality in heart disease, stroke and cancer. The etiology remains poorly understood, but may include neuroendocrine, behavioral and genetic mediators.
authors.affiliation: Department of Family Medicine, University of Michigan, Ann Arbor, MI 48109-0239, USA. ktgold@umich.edu
authors.forename: Katherine J
authors.initials: KJ
authors.lastname: Gold
authors.forename: Vanessa K
authors.initials: VK
authors.lastname: Dalton
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Schwenk
authors.forename: Rodney A
authors.initials: RA
authors.lastname: Hayward
mesh_terms: D000022:Abortion, Spontaneous / Q000453:epidemiology / Q000209:etiology* / Q000523:psychology*; D000293:Adolescent; D000328:Adult; D015331:Cohort Studies; D005260:Female; D005313:Fetal Death / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D007407:Interviews as Topic; D016015:Logistic Models; D001523:Mental Disorders / Q000150:complications* / Q000453:epidemiology; D011247:Pregnancy / Q000523:psychology; D012307:Risk Factors; D014481:United States / Q000453:epidemiology