Background: The Hamilton Rating Scale for Depression (HRSD) is one of the most frequently used instruments in antidepressant trials.
Methods: We examined different recommendations for classification of subjects according to depression severity by the HRSD.
Results: Several differences between recommendations were identified leading to the conclusion that a consensus on interpretation is largely missing.
Limitations: Brief narrative review.
Conclusions: Widely accepted standards for the interpretation of scores on the HRSD are needed.
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