The methodology incorporated a systematic review of randomized controlled trials from both Chinese and English literatures regarding traditional Chinese medicine (TCM) pattern-based treatments for depression. This encompassed a total of 61 studies and 2504 subjects across 27 TCM patterns. Due to varied TCM patterns among participants, the analysis focused on the four most prevalent ones: liver qi depression, liver depression and spleen deficiency, dual deficiency of the heart and spleen as well as liver depression and qi stagnation.

In the discussion of results, it was found that Xiaoyao decoction was most frequently used for the treatment of liver qi depression and liver depression with spleen deficiency, whereas Chaihu Shugan decoction was typically used for liver depression and qi stagnation. Commonly used herbs regardless of the prescribed Chinese herbal formulas included Bai Shao and Chai Hu. Typically, the individual studies did not provide an underlying rationale for herb selection, limiting the conclusions one could draw regarding the efficacy of certain herbal formulas and the response of specific TCM patterns to these treatments.