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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 133 2243 2090 1265 1162 674 62124

Clifford Y. Ko publications per year

The chart shows the history of publications by Clifford Y. Ko between 1995 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Clifford Y. Ko published across 32 years, from 1995 to 2026, averaging 20.2 papers a year. Output peaked at 51 publications in 2009. 2 of the 645 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 1995 to 2026. Vertical axis: number of publications, 0 to 51. Peak 51 publications in 2009. 1995: 7 publications 1996: 5 publications 1997: 5 publications 1998: 2 publications 1999: 0 publications 2000: 3 publications 2001: 4 publications 2002: 9 publications 2003: 26 publications 2004: 22 publications 2005: 16 publications 2006: 28 publications 2007: 43 publications 2008: 38 publications 2009: 51 publications 2010: 43 publications 2011: 45 publications 2012: 36 publications 2013: 34 publications 2014: 39 publications 2015: 33 publications 2016: 34 publications 2017: 28 publications 2018: 26 publications 2019: 25 publications 2020: 21 publications 2021: 19 publications 2022: 0 publications 2023: 1 publication 2024: 0 publications 2025: 0 publications 2026: 2 publications
1995 2026

645 publications in total across all disciplines

View publications per year as a table
Clifford Y. Ko: publications per year, 1995 to 2026
Year Publications
1995 7
1996 5
1997 5
1998 2
1999 0
2000 3
2001 4
2002 9
2003 26
2004 22
2005 16
2006 28
2007 43
2008 38
2009 51
2010 43
2011 45
2012 36
2013 34
2014 39
2015 33
2016 34
2017 28
2018 26
2019 25
2020 21
2021 19
2022 0
2023 1
2024 0
2025 0
2026 2
Total 645
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Clifford Y. Ko publications per year - data summary

  • Clifford Y. Ko, a Medicine scholar from University of California, Los Angeles, has 645 publications recorded across 32 years, from 1995 to 2026.
  • The oldest publication on record dates to 1995 and the most recent to 2026.
  • The most productive year is 2009, with 51 publications.
  • The least productive year with any output is 2023, with 1 publication.
  • 4 of the 32 years in the span carry no publications at all (1999, 2022, 2024 and 2025).
  • The rate of publication averages 20.2 papers per year over the whole span, or 23.0 per year counting only the 28 years with at least one publication.
  • The last 5 years on the chart (2022-2026) hold 3 publications, <1% of the career total.
  • Split into equal eras - 1995-2005: 99 publications (9.0 per year); 2006-2016: 424 publications (38.5 per year); 2017-2026: 122 publications (12.2 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Clifford Y. Ko 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 Clifford Y. Ko sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 661–680 publications, is where this scientist sits. 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
101–120 publications 1,796+

This scientist: 674 publications — 79th percentile

79% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340 674
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Clifford Y. Ko publication distribution in Medicine in 2026 - data summary

  • The chart plots the publication count of all 20,134 Medicine scientists ranked by Research.com in 2026, grouped into 86 ranges running from 101–120 to 1,796+ publications.
  • Clifford Y. Ko, a Medicine scholar from University of California, Los Angeles, records 674 publications - the 79th percentile of the discipline.
  • 79% of ranked Medicine scientists score the same or lower than Clifford Y. Ko, and about 21% score higher.
  • The median of the discipline falls in the 441–460 publications range, and Clifford Y. Ko ranks above the median.
  • The most crowded range is 341–360 publications, holding 922 scientists (5% of the field).
  • 64% of the field sits in the lowest quarter of the value range (up to 521–540 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 1,796 publications or more, 100 scientists in all (<1% of the field).

Clifford Y. Ko 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 Clifford Y. Ko sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 132–133 D-Index, is where this scientist sits. 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
70–71 D-Index 217+

This scientist: 133 D-Index — 89th percentile

89% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808
96–97 779
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168 133
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Clifford Y. Ko D-index placement in Medicine in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 20,134 Medicine scientists ranked by Research.com in 2026, grouped into 75 ranges running from 70–71 to 217+ D-Index.
  • Clifford Y. Ko, a Medicine scholar from University of California, Los Angeles, records 133 D-Index - the 89th percentile of the discipline.
  • 89% of ranked Medicine scientists score the same or lower than Clifford Y. Ko, and about 11% score higher.
  • The median of the discipline falls in the 94–95 D-Index range, and Clifford Y. Ko ranks above the median.
  • The most crowded range is 82–83 D-Index, holding 1,027 scientists (5% of the field).
  • 70% of the field sits in the lowest quarter of the value range (up to 106–107 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 217 D-Index or more, 98 scientists in all (<1% of the field).

Overview

Clifford Y. Ko is affiliated with the University of California, Los Angeles, in the United States. Their work spans several fields related to medicine, including health professions, orthopedics and sports medicine, surgery, and endocrinology, diabetes, and metabolism.

The main fields of study for Clifford Y. Ko encompass Medicine and Health Professions. Within these broader domains, their research covers a variety of subfields such as General Health Professions, Orthopedics and Sports Medicine, Surgery, and Endocrinology, Diabetes and Metabolism.

Topics frequently addressed by Ko include Hermeneutics and Narrative Identity, Aging, Elder Care, and Social Issues, Health, Medicine and Society, Foot and Ankle Surgery, Tendon Structure and Treatment, Orthopedic Surgery and Rehabilitation, and Diabetic Foot Ulcer Assessment and Management.

Ko has authored several recent papers, demonstrating a focus on clinical and surgical aspects of health care, particularly among older adults and in foot and ankle surgery. The recent publications are:

  • Perioperative Pain Management Issues Unique to Older Adults Undergoing Surgery: A Narrative Review, 2021, PubMed
  • The Effect of Frontal Deformity at the Ankle Joint on Total Ankle Arthroplasty Revision Rate, 2023, The Journal of Foot & Ankle Surgery
  • An Algorithm for Evaluation and Management of Diabetic Foot Ulcers, 2021, Diabetes & its Complications
  • Table of Contents, 2023, Gastroenterology

Frequent coauthors collaborating with Clifford Y. Ko include William D. Chey, Adam D. Shellito, Jill Q. Dworsky, Patrick Kirkland, and Ronnie A. Rosenthal.

Publication venues associated with Ko's work cover several journals with relevant medical and surgical scopes. These venues are PubMed, The Journal of Foot & Ankle Surgery, Diabetes & its Complications, and Gastroenterology.

Best Publications

  • Colon Cancer Survival Rates With the New American Joint Committee on Cancer Sixth Edition Staging

    Jessica B. O'Connell;Melinda A. Maggard;Clifford Y. Ko

  • Development and Evaluation of the Universal ACS NSQIP Surgical Risk Calculator: A Decision Aid and Informed Consent Tool for Patients and Surgeons

    Karl Y. Bilimoria;Yaoming Liu;Jennifer L. Paruch;Lynn Zhou

  • The National Cancer Data Base: A Powerful Initiative to Improve Cancer Care in the United States

    Karl Y. Bilimoria;Andrew K. Stewart;David P. Winchester;Clifford Y. Ko

  • Toward Robust Information: Data Quality and Inter-Rater Reliability in the American College of Surgeons National Surgical Quality Improvement Program

    Mira Shiloach;Stanley K. Frencher;Janet E. Steeger;Katherine S. Rowell

  • The aging population and its impact on the surgery workforce.

    David A. Etzioni;Jerome H. Liu;Melinda A. Maggard;Clifford Y. Ko

  • Optimal Preoperative Assessment of the Geriatric Surgical Patient: A Best Practices Guideline From the American College of Surgeons National Surgical Quality Improvement Program and the American Geriatrics Society

    Warren B. Chow;Ronnie A. Rosenthal;Ryan P. Merkow;Clifford Y. Ko

  • American College of Surgeons and Surgical Infection Society: Surgical Site Infection Guidelines, 2016 Update

    Kristen A. Ban;Kristen A. Ban;Joseph P. Minei;Christine Laronga;Brian G. Harbrecht

  • Extent of surgery affects survival for papillary thyroid cancer.

    Karl Y. Bilimoria;David J. Bentrem;Clifford Y. Ko;Clifford Y. Ko;Andrew K. Stewart

  • First Report from the American College of Surgeons -- Bariatric Surgery Center Network: Laparoscopic Sleeve Gastrectomy has Morbidity and Effectiveness Positioned Between the Band and the Bypass

    Matthew M. Hutter;Bruce D. Schirmer;Daniel B. Jones;Clifford Y. Ko

  • Does surgical quality improve in the American College of Surgeons National Surgical Quality Improvement Program: an evaluation of all participating hospitals.

    Bruce L. Hall;Barton H. Hamilton;Karen Richards;Karl Y. Bilimoria

  • Small bowel cancer in the United States: changes in epidemiology, treatment, and survival over the last 20 years.

    Karl Y Bilimoria;David Jason Bentrem;Jeffrey D Wayne;Clifford Y. Ko;Clifford Y. Ko

  • Underlying Reasons Associated With Hospital Readmission Following Surgery in the United States

    Ryan P. Merkow;Mila H. Ju;Mila H. Ju;Jeanette W. Chung;Bruce L. Hall

  • Updated population-based review of carcinoid tumors.

    Melinda A Maggard;Jessica B O'Connell;Clifford Y Ko

  • Quality improvement in surgery: the American College of Surgeons National Surgical Quality Improvement Program approach.

    Angela M. Ingraham;Karen E. Richards;Bruce L. Hall;Bruce L. Hall;Clifford Y. Ko;Clifford Y. Ko

  • Preoperative Predictors of Weight Loss Following Bariatric Surgery: Systematic Review

    Masha Livhits;Cheryl Mercado;Irina Yermilov;Janak A. Parikh

  • National Failure to Operate on Early Stage Pancreatic Cancer

    Karl Y. Bilimoria;David J. Bentrem;Clifford Y. Ko;Clifford Y. Ko;Andrew K. Stewart

  • Optimizing ACS NSQIP Modeling for Evaluation of Surgical Quality and Risk: Patient Risk Adjustment, Procedure Mix Adjustment, Shrinkage Adjustment, and Surgical Focus

    Mark E. Cohen;Clifford Y. Ko;Clifford Y. Ko;Karl Y. Bilimoria;Karl Y. Bilimoria;Lynn Zhou

  • Optimal Perioperative Management of the Geriatric Patient: A Best Practices Guideline from the American College of Surgeons NSQIP and the American Geriatrics Society

    Sanjay Mohanty;Sanjay Mohanty;Ronnie A. Rosenthal;Marcia M. Russell;Mark D. Neuman

  • Complication Rates Following Open Reduction and Internal Fixation of Ankle Fractures

    Nelson F. SooHoo;Lucie Krenek;Michael J. Eagan;Barkha N. Gurbani

  • Validation of the 6th edition AJCC Pancreatic Cancer Staging System: report from the National Cancer Database.

    Karl Y Bilimoria;Karl Y Bilimoria;David Jason Bentrem;Clifford Y. Ko;Clifford Y. Ko;Jamie Ritchey

Frequent Co-Authors

Karl Y. Bilimoria
Karl Y. Bilimoria Indiana University
David J. Bentrem
David J. Bentrem Northwestern University
David P. Winchester
David P. Winchester American College of Surgeons
Mark S. Talamonti
Mark S. Talamonti NorthShore University HealthSystem
Patricia A. Ganz
Patricia A. Ganz University of California, Los Angeles
Katherine L. Kahn
Katherine L. Kahn University of California, Los Angeles
Robert H. Brook
Robert H. Brook RAND Corporation
Justin B. Dimick
Justin B. Dimick University of Michigan–Ann Arbor
David B. Hoyt
David B. Hoyt American College of Surgeons
Paul G. Shekelle
Paul G. Shekelle RAND Corporation

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