The Clinical Global Impression Scale consists of three different global measures:
1. The severity of the illness: assesses the current severity of the patient's symptoms (CGI-S). 2. Global improvement: compares the patient's baseline condition with his or her current state (CGI-I). 3. Efficacy index: compares the patient's baseline condition to a ratio of current therapeutic benefit and severity of side effects (CGI-E) [8].
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