title: How prevalent are anxiety disorders in schizophrenia? A meta-analysis and critical review on a significant association.
abstract: OBJECTIVE
  The presence of anxiety disorders (AD) in schizophrenia (SZ) is attracting increasing interest. However, published studies have yielded very broad variations in prevalence rates across studies. The current meta-analysis sought to (1) investigate the prevalence of co-occurring AD in SZ by reporting pooled prevalence rates and (2) identify potential sources of variations in reported rates that could guide our efforts to identify and treat these co-occurring disorders in patients with SZ.
  
  
  METHODS
  We performed a systematic search of studies reporting prevalence of AD in SZ and related psychotic disorders. Mean prevalence rates and 95% confidence intervals (CIs) were first computed for each disorder. We then examined the impact of potential moderators related to patient sampling or to AD assessment methods on these rates.
  
  
  RESULTS
  Fifty-two eligible studies were identified. Pooled prevalence rates and CIs were 12.1% (7.0%-17.1%) for obsessive-compulsive disorders, 14.9% (8.1%-21.8%) for social phobia, 10.9% (2.9%-18.8%) for generalized AD, 9.8% (4.3%-15.4%) for panic disorders, and 12.4% (4.0%-20.8%) for post-traumatic stress disorders. For all disorders, we found significant heterogeneity in rates across studies. This heterogeneity could at least partially be explained by the effect of moderator variables related to patient characteristics or assessment methods.
  
  
  CONCLUSIONS
  AD are highly prevalent in SZ, but important variations in rates are observed between studies. This meta-analysis highlights several factors that affect risk for, or detection of AD in SZ, and could, thus, have an important impact on treatment and outcome of SZ patients.
authors: Centre de Recherche Université Laval Robert-Giffard, 2601 de la Canardière, Québec (Beauport), PQ, Canada. amelie.achim@crulrg.ulaval.ca
authors: Amélie M
authors: AM
authors: Achim
authors: Michel
authors: M
authors: Maziade
authors: Eric
authors: E
authors: Raymond
authors: David
authors: D
authors: Olivier
authors: Chantal
authors: C
authors: Mérette
authors: Marc-André
authors: MA
authors: Roy
mesh_terms: D000379:Agoraphobia / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D001008:Anxiety Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D015897:Comorbidity; D003430:Cross-Sectional Studies; D006801:Humans; D009771:Obsessive-Compulsive Disorder / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D016584:Panic Disorder / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D010698:Phobic Disorders / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D011618:Psychotic Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D012559:Schizophrenia / Q000175:diagnosis / Q000453:epidemiology*; D012565:Schizophrenic Psychology; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology