3 Evidence-Based CBT

CBT is one of the most well-researched and widely used forms of therapy in mental health care today.  Studies have found that CBT is especially effective for things like anxiety disorders, depression, PTSD, eating disorders, and substance use. One of the most significant benefits of CBT is that the skills you learn during therapy have a lasting impact, meaning they can persist and help manage challenges long after treatment ends.

One way to determine whether a treatment has a broad base of evidence is to conduct a meta-analysis. A meta-analysis is a statistical method used in research to systematically combine the results of multiple individual studies that examine the same research question. Essentially, the meta-analysis is a study of studies.  By aggregating data from multiple studies, a meta-analysis provides a more comprehensive and reliable estimate of the overall effect or relationship under investigation.  CBT has been studied extensively in numerous studies and meta-analyses to assess its treatment impact.

In 2012, Hofmann et al. published “The Efficacy of Cognitive Behavioral Therapy: A Review of Meta-Analyses.”  In their review, they identified 269 meta-analytic studies of CBT which explore the impact of CBT in fourteen areas of clinical practice (substance use disorder, schizophrenia and other psychotic disorders, depression/dysthymia, bipolar disorder, anxiety disorders, somatoform disorders, eating disorders, insomnia, personality disorders, anger and aggression, criminal behaviors, general stress, distress due to general medical conditions, chronic pain/fatigue, distress related to pregnancy complications and female hormonal conditions).

They found that CBT was demonstrably effective across all of these areas, with strong evidence for the use of CBT specifically in treating anxiety disorders, somatoform disorders, bulimia, anger control problems, and general stress. They also noted that, at the time of their publication, there was limited evidence on the use of CBT with various populations beyond support for its use with children or the elderly, and called for continued population-specific research and randomized controlled trials to explore the causal effects of CBT.

Just over 10 years later, Cuijpers et al. published their meta-analysis on the impact of using CBT in treating mood disorders (depression) in  2023.  In their study, they explore data on CBT outcomes from randomized trials examining CBT’s effects and its efficacy compared with other psychotherapies, pharmacotherapies, and combined treatments for depression.  They included 409 trials (518 comparisons) with 52,702 identified patients. They found that CBT had a “moderate to large” impact on depression when compared to control conditions, such as traditional care as usual and/or waitlist.

In their study, CBT was significantly more effective than other psychotherapies, though they note that the difference was slight. CBT was noted to have the same impact as pharmacotherapies in the short term (less than 6 months), but was significantly more effective than pharmacotherapies in the long term (6-12 months). Lastly, they found that CBT combined with pharmacotherapies was more effective than either treatment alone in both the short and long term. These data support the findings of Hofmann et al. (2012), indicating that CBT has broad, positive effects across a wide range of clinical presentations, including generalized anxiety, the focus of this text.