Assessing "Recent" Citations in Biomedical Research

A recent analysis published in The BMJ has revealed intriguing insights into the usage of the term "recent" in biomedical literature. Researchers from Spain conducted a comprehensive study examining how frequently authors cite references deemed "recent" and determined the actual ages of these citations. The findings prompt a critical reassessment of citation practices in the field.

Study Overview

To ascertain how "recent" these so-called recent studies truly are, the researchers analyzed 1,000 biomedical articles. They specifically identified and reviewed 20 predefined expressions linked to citing sources, all denoting recency. Here are the key findings from their research:

Findings on Citation Patterns

The study highlighted that the frequency of citation lags varied significantly across different medical specialties. Particularly remarkable was the distinction between fields, as reflected in the following observations:

• Shorter Lags: Critical care, infectious diseases, genetics, immunology, and radiology showed median citation lags of approximately two years.
• Longer Lags: In contrast, nephrology, veterinary medicine, and dentistry exhibited significantly longer citation lags, averaging between 8.5 to 14 years.

Among the various expressions used to denote recentness, the terms recent approach, recent discovery, and recent study were generally linked to older references. Conversely, recent publication and recent article tended to correlate with more contemporary research.

Trends Observed Over Time

The authors of the study observed a notable pattern wherein the citation lag had improved over time. Articles published between 2020 and 2025 showed a trend toward shorter citation lags, with journals boasting a high impact factor (12 or higher) correlating with more recent citations.

“This playful analysis suggests that 'recent' can mean anything from last season to last century. Readers, reviewers, and editors may want to take 'recent' claims with a grain of chronological salt.” – Researchers from Spain

Study Limitations

Although these findings present an intriguing landscape of citations in biomedical research, the authors do acknowledge certain limitations of their analysis:

• The assessment focused solely on the age of the cited studies and did not evaluate the relevance or quality of those references.
• The study analyzed only the first eligible "recent" expression per article, which may not provide a comprehensive insight into citation practices.

Conclusion

This study sheds light on the flexible semantics of the term "recent" in biomedical writing. Given that nearly 18% of "recent" citations are over a decade old, it underpins the need for a more precise understanding of citation practices. For readers and researchers alike, these insights into citation lags serve as an important reminder of not only the evolution of scientific literature but also the need for vigilance in evaluating the relevance of cited references.

References

More information can be found in the study titled “How recent is recent? Retrospective analysis of suspiciously timeless citations,” published in The BMJ (2025). This document is subject to copyright; for more details, visit Medical Xpress.