Cognitive behavioural therapy for major psychiatric disorder: does it really work? A meta-analytical review of well-controlled trials.
BACKGROUND
Although cognitive behavioural therapy (CBT) is claimed to be effective in schizophrenia, major depression and bipolar disorder, there have been negative findings in well-conducted studies and meta-analyses have not fully considered the potential influence of blindness or the use of control interventions.


METHODS
We pooled data from published trials of CBT in schizophrenia, major depression and bipolar disorder that used controls for non-specific effects of intervention. Trials of effectiveness against relapse were also pooled, including those that compared CBT to treatment as usual (TAU). Blinding was examined as a moderating factor.


RESULTS
CBT was not effective in reducing symptoms in schizophrenia or in preventing relapse. CBT was effective in reducing symptoms in major depression, although the effect size was small, and in reducing relapse. CBT was ineffective in reducing relapse in bipolar disorder.


CONCLUSIONS
CBT is no better than non-specific control interventions in the treatment of schizophrenia and does not reduce relapse rates. It is effective in major depression but the size of the effect is small in treatment studies. On present evidence CBT is not an effective treatment strategy for prevention of relapse in bipolar disorder.
Lynch
D
D
Stobhill Hospital, Glasgow, UK.
Laws
K R
KR
McKenna
P J
PJ
D000328:Adult; D001714:Bipolar Disorder / Q000523:psychology / Q000628:therapy*; D015928:Cognitive Behavioral Therapy / Q000379:methods*; D018849:Controlled Clinical Trials as Topic; D003865:Major Depressive Disorder / Q000523:psychology / Q000628:therapy*; D006801:Humans; D011618:Psychotic Disorders / Q000523:psychology / Q000628:therapy*; D012559:Schizophrenia / Q000628:therapy*; D012565:Schizophrenic Psychology; D055502:Secondary Prevention; D016896:Treatment Outcome