Publication bias in meta-analysis: its causes and consequences.

Area of Science:

• Medical Research
• Biostatistics
• Scientific Publishing

Background:

• Publication bias is a significant challenge in research, potentially skewing results.
• It affects the reliability of evidence synthesis, particularly in meta-analyses.
• Understanding the sources of bias is crucial for accurate scientific interpretation.

Purpose of the Study:

• To review factors contributing to publication bias in study design and execution.
• To examine the roles of authors, editors, and reviewers in the publication process.
• To assess methods for detecting, correcting, and preventing publication bias.

Main Methods:

• Literature review of studies on publication bias.
• Analysis of factors influencing study submission and publication decisions.
• Evaluation of existing methods for bias detection and correction.

Main Results:

• Study design and meta-analysis execution are key sources of publication bias.
• Author decisions, journal editorial policies, and reviewer practices significantly impact publication.
• Current methods for addressing publication bias have inherent limitations.

Conclusions:

• Publication bias poses a persistent threat to research integrity.
• While detection and correction methods exist, they are imperfect.
• Achieving complete prevention through universal trial registration or publication remains an aspirational goal.