Institutional positions in the ranking are determined by the aggregate of D-indexes (Discipline H-index) for all ranking scholars whose main area of scholarly output is Medicine and who are affiliated with each university. The D-index is metrics-based and strictly includes only publications and citation data that are relevant to the evaluated discipline, ensuring specificity and comparability within the field.
Scope of Research and Criteria
The current edition’s scope is exceptionally comprehensive, examining a total of 279,971 scientist profiles sourced from diverse bibliometric databases. Of these, 72,221 scientists specializing in Medicine were subjected to detailed analysis. For a researcher to qualify for consideration, a D-index threshold of 70 was established, and the majority of their high-quality scholarly publications needed to be specifically in the area of Medicine.
Importantly, not only bibliometric indicators but also scientists’ awards and achievements within Medicine were considered. The D-index threshold for identifying the most distinguished researchers is incremented by 10 depending on the population size of the field, thereby ensuring the inclusion of the top 1% of leading scholars in each discipline. There is also a requirement that a scientist’s general H-index and their D-index must exhibit a proximity of 30% or less, further ensuring that their top scholarly output is genuinely discipline-specific. Once again, recognition such as awards and achievements in the field of study were significant factors in the evaluation process.
Verification and Quality Control
Recognizing that raw bibliometric data alone is not a definitive measure of scholarly contribution, the evaluation process included manual verification of all scientist profiles. These profiles were also cross-correlated with publications catalogued in a wide array of trustworthy sources to validate their relevance and impact.
Importantly, while the number of papers published in prominent journals and conference proceedings is not a criterion influencing a researcher’s position within the Research.com ranking, it is acknowledged as a valuable secondary signal of a scientist’s active engagement and contribution to their field. Each researcher's position in our ranking is exclusively determined using their H-index, derived from the latest data available in OpenAlex and CrossRef, the world’s most prominent bibliometric databases. To learn more about the comprehensive and meticulous methodology applied, please refer to our methodology page.
Research.com’s Agenda and Mission
The guiding mission behind the creation of our Medicine Universities ranking is to inspire scientists, business leaders, and policy makers worldwide to explore where top experts in Medicine are making advances. Our aim is to provide the global research community with a transparent and reliable instrument to identify the leading experts in specific disciplines, within various countries, and across research institutions.
By making this information accessible, we strive to empower collaboration, facilitate academic benchmarking, and ultimately foster the continued growth and excellence of the research ecosystem.
Key Results from the 4th Edition Medicine Universities Ranking
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Top 3 Institutions in South Africa (by number of leading scientists):
- University of Cape Town: 20 scientists
- Stellenbosch University: 8 scientists
- University of the Witwatersrand: 5 scientists
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World’s Most Prominent Institutions in Medicine: Harvard University, Harvard Medical School, Washington University in St. Louis, McMaster University, Johns Hopkins University, University of Oxford, University of Bristol, University of Pennsylvania, Yale University, and University of Cambridge.
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Top Three Scientists Globally in Medicine:
- Professor Walter C. Willett (Harvard University) – D-index: 411
- Ronald C. Kessler (Harvard University) – D-index: 332
- Meir J. Stampfer (Harvard University) – D-index: 330
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The average total D-index for the top 5% of universities is 16,901, compared to an average of 1,798 for all 875 institutions considered.
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The average number of published articles in Medicine by scientists in the top 5% of universities is 82,045, whereas the average across all ranked universities is 9,438.
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The average number of citations garnered by researchers affiliated with the top 1% of institutions stands at 17,279,971, versus 279,971 for the entire set of 875 universities.
These figures underscore the concentration of research excellence and influential scholarship at the very top tier of global institutions, while also highlighting the significant impact universities from South Africa have made in the field of Medicine. The careful, data-driven, and meticulously validated nature of the Research.com ranking ensures it remains a credible and valuable resource for the research community worldwide.
