World's Best Scientists 2026 revealed!

D-Index & Metrics

Medicine

D-Index
109
Citations
55786
World Ranking
5687
National Ranking
57

Siew C. Ng publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Siew C. Ng sits on this spectrum.

101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 610 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101 publications 1,796+

This scientist: 532 publications — 63rd percentile

63% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

Siew C. Ng D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Siew C. Ng sits on this spectrum.

70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 399 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70 D-Index 217+

This scientist: 109 D-Index — 72nd percentile

72% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

Overview

Siew C. Ng is affiliated with the Chinese University of Hong Kong in China and has a focused research profile primarily in the fields of Medicine and Biochemistry, Genetics and Molecular Biology. The scientist's work spans several subfields including Genetics, Infectious Diseases, Molecular Biology, Epidemiology, and Surgery.

The main topics covered by their research include:

  • Inflammatory Bowel Disease
  • Gut microbiota and health
  • Microscopic Colitis
  • Clostridium difficile and Clostridium perfringens research
  • COVID-19 Clinical Research Studies
  • Eosinophilic Esophagitis
  • Diet and metabolism studies

Among recent publications, the following papers have been noted for their relevance and citation impact:

  • "Alterations in Gut Microbiota of Patients With COVID-19 During Time of Hospitalization" (2020), Gastroenterology
  • "Gut microbiota composition reflects disease severity and dysfunctional immune responses in patients with COVID-19" (2021), Gut
  • "Manifestations and prognosis of gastrointestinal and liver involvement in patients with COVID-19: a systematic review and meta-analysis" (2020), The Lancet. Gastroenterology & Hepatology
  • "Crohn's disease" (2020), Nature Reviews Disease Primers
  • "Corticosteroids, But Not TNF Antagonists, Are Associated With Adverse COVID-19 Outcomes in Patients With Inflammatory Bowel Diseases: Results From an International Registry" (2020), Gastroenterology

The frequent co-authors who have contributed to Siew C. Ng's research work include:

  • Francis K.L. Chan
  • Joyce Wing Yan Mak
  • Richard B. Gearry
  • Gilaad G. Kaplan
  • David T. Rubin

Siew C. Ng's research is often published in a set of key journals that include:

  • Gastroenterology
  • Gut
  • Journal of Crohn's and Colitis
  • The Lancet. Gastroenterology & Hepatology
  • Inflammatory Bowel Diseases

The scientist has notably contributed extensively to the study of inflammatory bowel diseases and gut microbiota, often integrating aspects of infectious diseases and molecular biology to explore complex gastrointestinal and immunological conditions. Their work also addresses the implications of COVID-19 on gastrointestinal health and immune responses.

Best Publications

  • Worldwide incidence and prevalence of inflammatory bowel disease in the 21st century: a systematic review of population-based studies

    Siew C Ng;Hai Yun Shi;Hai Yun Shi;Nima Hamidi;Fox E Underwood

  • Global Prevalence of Helicobacter pylori Infection: Systematic Review and Meta-Analysis

    James K.Y. Hooi;Wan Ying Lai;Wee Khoon Ng;Wee Khoon Ng;Michael M.Y. Suen

  • Association analyses identify 38 susceptibility loci for inflammatory bowel disease and highlight shared genetic risk across populations

    J Z Liu;S van Sommeren;H Huang;S C Ng

  • Alterations in Gut Microbiota of Patients With COVID-19 During Time of Hospitalization.

    Tao Zuo;Fen Zhang;Grace C.Y. Lui;Yun Kit Yeoh

  • Gut microbiota composition reflects disease severity and dysfunctional immune responses in patients with COVID-19.

    Yun Kit Yeoh;Tao Zuo;Grace Chung Yan Lui;Fen Zhang

  • Metagenomic analysis of faecal microbiome as a tool towards targeted non-invasive biomarkers for colorectal cancer

    Jun Yu;Qiang Feng;Sunny Hei Wong;Dongya Zhang

  • Manifestations and prognosis of gastrointestinal and liver involvement in patients with COVID-19: a systematic review and meta-analysis.

    Ren Mao;Yun Qiu;Jin Shen He;Jin Yu Tan

  • Understanding and Preventing the Global Increase of Inflammatory Bowel Disease

    Gilaad G. Kaplan;Siew C. Ng

  • Crohn's disease

    Giulia Roda;Siew Chien Ng;Paulo Gustavo Kotze;Marjorie Argollo

  • Mechanisms of action of probiotics: Recent advances

    S C Ng;A L Hart;M A Kamm;A J Stagg

  • Incidence and phenotype of inflammatory bowel disease based on results from the Asia-pacific Crohn's and colitis epidemiology study.

    Siew C. Ng;Whitney Tang;Jessica Y. Ching;May Wong

  • Corticosteroids, But Not TNF Antagonists, Are Associated With Adverse COVID-19 Outcomes in Patients With Inflammatory Bowel Diseases: Results From an International Registry.

    Erica J. Brenner;Ryan C. Ungaro;Richard B. Gearry;Gilaad G. Kaplan

  • Geographical variability and environmental risk factors in inflammatory bowel disease

    Siew C. Ng;Charles N. Bernstein;Morten H. Vatn;Peter Laszlo Lakatos

  • Gut mucosal microbiome across stages of colorectal carcinogenesis

    Geicho Nakatsu;Xiangchun Li;Haokui Zhou;Jianqiu Sheng

  • Adherent-invasive Escherichia coli in inflammatory bowel disease

    Carolina Palmela;Caroline Chevarin;Zhilu Xu;Joana Torres

  • The Global Incidence of Appendicitis: A Systematic Review of Population-based Studies.

    Mollie Ferris;Samuel Quan;Belle S. Kaplan;Natalie Molodecky

  • The Gut Microbiota in the Pathogenesis and Therapeutics of Inflammatory Bowel Disease

    Tao Zuo;Siew C. Ng

  • Depicting SARS-CoV-2 faecal viral activity in association with gut microbiota composition in patients with COVID-19.

    Tao Zuo;Qin Liu;Fen Zhang;Grace Chung Yan Lui

  • Inflammatory bowel disease in Asia: A systematic review

    Lani Prideaux;Michael A Kamm;Michael A Kamm;Peter P De Cruz;Francis K L Chan

  • The epidemiology of inflammatory bowel disease: East meets west

    Wing Yan Mak;Mirabella Zhao;Siew Chien Ng;Johan Burisch

Frequent Co-Authors

Francis K.L. Chan
Francis K.L. Chan Chinese University of Hong Kong
Joseph J.Y. Sung
Joseph J.Y. Sung Nanyang Technological University
Justin C.Y. Wu
Justin C.Y. Wu Chinese University of Hong Kong
Michael A. Kamm
Michael A. Kamm University of Melbourne
Jun Yu
Jun Yu Chinese University of Hong Kong
Paul K.S. Chan
Paul K.S. Chan Chinese University of Hong Kong
Gilaad G. Kaplan
Gilaad G. Kaplan University of Calgary
Wai K. Leung
Wai K. Leung University of Hong Kong
Ailsa Hart
Ailsa Hart Imperial College London
Andrew J. Stagg
Andrew J. Stagg Queen Mary University of London

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