Examining the Clinical Global Impression Scale in Depression Treatment
Author Information
Author(s): Forkmann Thomas, Scherer Anne, Boecker Maren, Pawelzik Markus, Jostes Ralf, Gauggel Siegfried
Primary Institution: Institute of Medical Psychology and Medical Sociology, University Hospital of RWTH Aachen
Hypothesis
Is the Clinical Global Impression Scale (CGI) a valid measure of clinical change in patients with major depressive disorder?
Conclusion
The study found no strong evidence to recommend either the CGI improvement index or the severity index as the more valid measure of clinical change.
Supporting Evidence
- Effect sizes between CGI-I and CGI-S ratings were large for all three perspectives.
- Congruence between CGI ratings from patients and staff was low.
- Patients' ratings correlated most strongly with their Beck Depression Inventory scores.
Takeaway
This study looked at how well doctors and patients agree on how much a patient has improved from depression treatment, and it found that they often see things differently.
Methodology
Patients rated their depression using the Beck Depression Inventory and the Clinical Global Impression Scale from three perspectives: the patient, the treating therapist, and the team of therapists.
Potential Biases
The study's design may have influenced clinician ratings due to lack of blinding.
Limitations
The sample size was small and only included patients with major depressive disorder, limiting generalizability.
Participant Demographics
Mean age was 45.3 years, with 58.1% being women.
Statistical Information
P-Value
p<0.001
Confidence Interval
CI .15 to .59
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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