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Performance status assessment in cancer patients. An inter-observer variability study
J B Sørensen1, M Klee, T Palshof
1Department of Oncology, Finsen Institute/Rigshospitalet, Copenhagen, Denmark.
British Journal of Cancer
|April 1, 1993
Summary
The ECOG Performance Status (PS) scale shows moderate agreement among oncologists, with higher consistency when categorizing patients into groups 0-2 versus 3-4, which is clinically relevant.
Area of Science:
- Oncology
- Clinical Assessment
- Biostatistics
Background:
- The ECOG Performance Status (PS) scale is crucial for assessing cancer patient function and prognosis.
- It categorizes patient well-being from normal activity (PS 0) to completely bedridden (PS 4).
- Variability in PS assessment can impact clinical trial eligibility and patient management.
Purpose of the Study:
- To evaluate the inter-observer agreement among oncologists using the ECOG Performance Status scale.
- To quantify the reliability of PS assessments in a clinical setting.
- To assess agreement across all PS categories and for clinically relevant groupings.
Main Methods:
- Three oncologists independently rated the PS of 100 consecutive cancer patients.
- Kappa statistics were used to measure non-chance agreement between observers.
- Agreement was analyzed for individual PS categories (0-4) and broader groupings (0-2 vs. 3-4).
Main Results:
- Overall inter-observer agreement (Kappa) was moderate at 0.44.
- Individual Kappa values ranged from 0.31 to 0.55 across PS categories.
- High agreement was found when categorizing patients into PS 0-2 (92% probability) versus PS 3-4 (82% probability).
Conclusions:
- Inter-observer agreement for the ECOG Performance Status scale is only moderate overall.
- However, there is high agreement for the clinically significant distinction between PS 0-2 and PS 3-4.
- This suggests the broader PS categories are reliably assessed and useful in clinical studies.