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The article you requested is

Relationships Between Obsessive-Compulsive Symptomatology and Severity of Psychosis in Schizophrenia: A Systematic Review and Meta-Analysis

J Clin Psychiatry 2009;70(1):70-82
10.4088/JCP.07r03618
Copyright 2008 Physicians Postgraduate Press, Inc.

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Objective: The presence of obsessive-compulsive symptoms (OCS) or obsessive-compulsive disorder (OCD) is common in patients with schizophrenia. The impact of OCS and OCD on severity of psychotic symptoms has been assessed in several past studies yielding inconclusive results. In this report, we aim to integrate the findings of prior studies by means of a systematic review followed by a meta-analysis.

Datasource: A search of studies in PubMed (from 1950 to September 2006) and PsycINFO (from 1966 to September 2006) databases was performed to assess the influence of OCS and OCD on severity of psychotic symptoms in patients with schizophrenia using as syntax ("schizophrenia" OR "psychosis" OR "psychotic") AND ("obsessive-compulsive disorder" OR "OCD" OR "obsession*" OR "compulsion*" OR "obsessiv*" OR "compulsiv*"). Reference lists of all retrieved articles were also hand-searched.

Study Selection: Twenty-three studies were included in the systematic review, and 18 articles provided usable data for the meta-analysis.

Data Extraction: All relevant data were extracted using a standardized report form by 2 investigators. Effect sizes and pooled estimates were calculated. Data were analyzed separately for studies using an OCS or OCD definition.

Data Synthesis: The presence of OCS was significantly associated with greater severity of global psychotic symptoms (standardized mean difference [95% CI], 0.39 [0.14 to 0.64]), positive psychotic symptoms (0.28 [0.00 to 0.56]), and negative psychotic symptoms (0.36 [0.11 to 0.62]). In contrast, no differences in the severity of global psychotic symptoms (0.19 [-0.14 to 0.51]), positive psychotic symptoms
(-0.01 [-0.20 to 0.19]), or negative psychotic symptoms (-0.11 [-0.30 to 0.08]) were found for the OCD versus non-OCD subgroups.

Conclusion: This first meta-analysis revealed that the presence of obsessive-compulsive symptoms in schizophrenia is associated with higher global, positive, and negative psychotic symptoms. This association was not found when a categorical definition of obsessive-compulsive disorder was used.