Related Experiment Videos
Inter-observer variability among pathologists' evaluation of malignant melanoma: effects upon an analytic study
N Krieger1, R A Hiatt, R W Sagebiel
1Division of Research, Kaiser Permanente Medical Care Program, Oakland, CA 94611, USA.
Journal of Clinical Epidemiology
|August 1, 1994
Summary
Inter-observer variability in rating malignant melanoma tumors impacted study results. Consensus readings are recommended over individual ratings for epidemiologists to ensure data reliability.
Area of Science:
- Dermatology
- Epidemiology
- Pathology
Background:
- Investigating surveillance bias in malignant melanoma cases linked to Lawrence Livermore National Laboratory.
- Utilizing a cohort of 20 Laboratory cases and 36 controls diagnosed between 1970-1984.
Purpose of the Study:
- To assess the impact of inter-observer variability in tumor characteristic ratings on surveillance bias research.
- To determine if dermatopathologist agreement influences study outcomes.
Main Methods:
- Three dermatopathologists independently and jointly rated tumor characteristics (thickness, histologic type) from melanoma cases.
- Pathologists were blinded to subjects' Laboratory employment status.
- Statistical analysis included calculating mean differences and kappa statistics for agreement.
Main Results:
- Mean difference in tumor thickness between reviewers and consensus was minimal (-0.06 mm to 0.00 mm).
- Agreement on histologic type was significantly lower (kappa = 0.48).
- Study hypothesis rejection varied depending on whether consensus or individual reviewer data was used.
Conclusions:
- Inter-observer variability, particularly in histologic typing, can affect epidemiological study results.
- Employing consensus readings is advisable for epidemiologists when dealing with data prone to inter-observer variability.
- This approach enhances the reliability and validity of findings in surveillance bias research.