What is the problem with publication bias?

What is the problem with publication bias?

• A. It biases the peer-review process
• B. It increases the cost of research
• C. It leads to too many negative results being published
• D. A large amount of medical research is never published and studies that are published are more likely to report favorable results

Answer: (D)

Publication bias distorts the evidence base by hiding studies with negative or non-significant results and favoring positive findings. In medical research, many studies with null or unfavorable outcomes go unpublished, while those with favorable results are more likely to appear in the literature. This means the published literature does not reflect all the work that was done, which skews systematic reviews and meta-analyses, inflates perceived treatment effects, and can mislead clinicians and policymakers. It also wastes resources by giving a misleading impression of what actually works. The problem described—much medical research goes unreported and published studies tend to report favorable results—captures the core issue.

Publication bias distorts the evidence base by hiding studies with negative or non-significant results and favoring positive findings. In medical research, many studies with null or unfavorable outcomes go unpublished, while those with favorable results are more likely to appear in the literature. This means the published literature does not reflect all the work that was done, which skews systematic reviews and meta-analyses, inflates perceived treatment effects, and can mislead clinicians and policymakers. It also wastes resources by giving a misleading impression of what actually works. The problem described—much medical research goes unreported and published studies tend to report favorable results—captures the core issue.