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Has Embase replaced MEDLINE since coverage expansion?

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Researchers did not increase Embase usage over MEDLINE after Embase expanded coverage. Despite Embase including all MEDLINE records, academic medical institutions in the US and Canada did not switch databases.

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Area of Science:

  • Bibliometrics
  • Medical Informatics
  • Research Methodology

Background:

  • Embase expanded its coverage in 2010 to include all MEDLINE records.
  • This expansion aimed to enhance Embase's comprehensiveness and potentially influence database selection by researchers.
  • Academic medicine communities in the United States and Canada were surveyed regarding their database usage.

Purpose of the Study:

  • To test the hypothesis that Embase usage would increase to replace MEDLINE post-2010 expansion.
  • To analyze shifts in database utilization within academic medical institutions.
  • To evaluate the impact of Embase's expanded coverage on researcher choices.

Main Methods:

  • Libraries of 140 US and 17 Canadian medical schools confirmed Embase subscriptions.
  • Ovid MEDLINE and Embase were searched for publications from affiliated researchers.
  • 100 records were randomly selected from 5 years pre- and post-2010 for analysis.

Main Results:

  • The number of studies exclusively using Embase (not MEDLINE) showed no significant change.
  • No increase in Embase-only studies was observed in the period following the coverage expansion.
  • Database usage patterns remained consistent despite Embase's enhanced MEDLINE coverage.

Conclusions:

  • The hypothesis that Embase would replace MEDLINE was refuted.
  • Academic medical researchers in the US and Canada did not shift to Embase exclusively post-expansion.
  • Institutional access to Embase did not lead to its adoption as a MEDLINE replacement.