Insight in schizophrenia: a meta-analysis.

There has been an increase in the study of insight in schizophrenia in the last 20 years. Insight is operationally defined according to five dimensions which include: the patient's awareness of mental disorder, awareness of the social consequences of disorder, awareness of the need for treatment, awareness of symptoms and attribution of symptoms to disorder. Despite the development of psychometrically sound measurement tools, the results from previous studies have been inconclusive regarding the nature of the relationship between insight and symptomatology. A meta-analysis of 40 published English-language studies was conducted to determine the magnitude and direction of the relationship, or effect size, between insight and symptom domains in schizophrenia and to determine moderator variables that were associated with the variations in effect sizes across studies. Results indicated that there was a small negative relationship between insight and global, positive and negative symptoms. There was also a small positive relationship between insight and depressive symptoms in schizophrenia. Acute patient status and mean age of onset of the disorder moderated the relationship between insight and symptom clusters. The possible reasons for the effect sizes being modest, the examination of the role of moderator variables and directions for future research are provided.