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Collider bias and the obesity paradox
Nobuyuki Horita1, Shingo Kato2, Daisuke Utsunomiya2
1is with the Chemotherapy Center, Yokohama City University Hospital, Yokohama, Japan.
Nutrition Reviews
|September 15, 2022
Summary
The obesity paradox, where obese individuals show better health outcomes, may be explained by collider bias. Further research using advanced analytical methods is needed to clarify the true nature of obesity bias.
Area of Science:
- Epidemiology
- Biostatistics
Background:
- The obesity paradox describes counterintuitive findings where obesity is associated with better outcomes in certain diseases.
- This phenomenon challenges conventional understanding and requires rigorous investigation.
Purpose of the Study:
- To explore potential explanations for the obesity paradox.
- To highlight the role of collider bias as a significant factor.
Main Methods:
- Discussion of the concept of collider bias in epidemiological research.
- Analysis of how collider bias can distort findings related to obesity and health outcomes.
Main Results:
- Collider bias is proposed as a primary explanation for the observed obesity paradox.
- The presence of collider bias in original studies can propagate to meta-analyses, affecting overall conclusions.
Conclusions:
- The obesity paradox may be an artifact of collider bias rather than a true biological phenomenon.
- Employing appropriate analytical techniques is crucial for accurately assessing obesity bias and its impact on health outcomes.
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