<P> A system review of Long Term Psychodynamic Psychotherapy in 2009 found an overall effect size of . 33 . Others have found effect sizes of . 44 --. 68 . </P> <P> According to a 2004 French review conducted by INSERM, psychoanalysis was presumed or proven effective at treating panic disorder, post-traumatic stress and personality disorders . </P> <P> The world's largest randomized controlled trial on therapy with anorexia nervosa outpatients, the ANTOP - Study, published 2013 in The Lancet, found evidence that modified psychodynamic therapy is effective in increasing body mass index after a 10 - month treatment and that the effect is persistent until at least a year after concluding the treatment . Relative to other treatments assigned, it was found to be as effective in increasing body mass index as cognitive behavioral therapy and as a standard treatment protocol (which consisted of referral to a list of psychotherapists with experience in treating eating - disorders in addition to close monitoring and treatment by a family doctor). Furthermore, considering the outcome to be the recovery rate one year after the treatment, measured by the proportion of patients who no longer met the diagnostic criteria for anorexia nervosa, modified psychodynamic therapy was found to be more effective than the standard treatment protocol and as effective as cognitive behavioral therapy . </P> <P> A 2001 systematic review of the medical literature by the Cochrane Collaboration concluded that no data exist demonstrating that psychodynamic psychotherapy is effective in treating schizophrenia and severe mental illness, and cautioned that medication should always be used alongside any type of talk therapy in schizophrenia cases . A French review from 2004 found the same . The Schizophrenia Patient Outcomes Research Team advises against the use of psychodynamic therapy in cases of schizophrenia, arguing that more trials are necessary to verify its effectiveness . </P>

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