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Targeted scoring criteria reduce variance in global impressions
Steven D Targum1, Joan Busner, Allan H Young
1Massachusetts General Hospital, Boston, Massachusetts, USA. sdtargum@yahoo.com
Human Psychopharmacology
|July 31, 2008
Summary
Defining specific criteria for Clinical Global Impression (CGI) ratings in central nervous system (CNS) trials is crucial. This improves rating consistency and reduces ambiguity caused by emergent symptoms, enhancing clinical trial reliability.
Area of Science:
- Psychiatry
- Clinical Psychology
- Neuroscience
Background:
- Clinical Global Impression (CGI) ratings are vital in central nervous system (CNS) trials.
- Treatment-emergent symptoms can confound CGI ratings, leading to scoring ambiguity and variance.
- Standardized scoring criteria are needed to improve the reliability of CGI assessments in clinical trials.
Purpose of the Study:
- To investigate how treatment-emergent physical or psychic symptoms affect CGI ratings in CNS trials.
- To evaluate the impact of targeted scoring criteria on clarifying CGI ratings and reducing scoring variance.
Main Methods:
- Twenty-four raters participated in a training session at an investigator meeting.
- Raters scored scripted CGI scenarios that included treatment-emergent symptoms.
- Scenarios were re-rated after presenting well-defined criteria to address scoring issues.
Main Results:
- Treatment-emergent gastrointestinal or anxiety symptoms significantly altered CGI-Improvement (CGI-I) ratings.
- These symptoms introduced broad scoring variance and ambiguity among raters.
- Implementing defined criteria narrowed variance and significantly improved inter-rater reliability.
Conclusions:
- CNS trials require pre-defined scoring criteria for global ratings to ensure consistency.
- Study-specific criteria should be tailored to targeted symptoms and drug mechanisms.
- These targeted criteria must be included in all published trial reports to ensure transparency and reproducibility.
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