World's Best Scientists 2026 revealed!

D-Index & Metrics

Medicine

D-Index
78
Citations
19898
World Ranking
18134
National Ranking
9040

Christopher M. Ryan 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 Christopher M. Ryan 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: 611 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: 206 publications — 3rd percentile

3% of scientists in this discipline score the same or lower.

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

Christopher M. Ryan 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 Christopher M. Ryan 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: 400 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: 78 D-Index — 12th percentile

12% of scientists in this discipline score the same or lower.

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

Overview

Christopher M. Ryan is affiliated with the University of Pittsburgh in the United States and has contributed extensively to the field of medicine, focusing primarily on endocrinology, diabetes, and metabolism. Their research spans various subfields including cardiology and cardiovascular medicine, psychiatry and mental health, clinical biochemistry, and physiology.

Their work concentrates on several main topics such as diabetes management and research, diabetes treatment and management, cardiovascular function and risk factors, diet and metabolism studies, diabetes and associated disorders, epilepsy research and treatment, and pharmacological effects and toxicity studies.

Christopher M. Ryan has published multiple papers in peer-reviewed medical journals. Notable recent publications include:

  • "Cognitive performance declines in older adults with type 1 diabetes: results from 32 years of follow-up in the DCCT and EDIC Study," 2021, The Lancet Diabetes & Endocrinology
  • "Aging, Diabetes, Obesity, and Cognitive Decline: A Population-Based Study," 2020, Journal of the American Geriatrics Society
  • "Brain Structure Among Middle-aged and Older Adults With Long-standing Type 1 Diabetes in the DCCT/EDIC Study," 2022, Diabetes Care
  • "Patterns of Regional Brain Atrophy and Brain Aging in Middle- and Older-Aged Adults With Type 1 Diabetes," 2023, JAMA Network Open
  • "Delays to care in infantile epileptic spasms syndrome: Racial and ethnic inequities," 2023, Epilepsia

Their frequent coauthors include Alan M. Jacobson, Barbara H. Braffett, Rose Gubitosi-Klug, Gayle M. Lorenzi, and José A. Luchsinger. Collaborative work with these researchers has contributed to multiple publications, indicating ongoing partnerships in diabetes and related health fields.

Christopher M. Ryan's research has been published regularly in several prominent scientific journals, with recurring appearances in Diabetes Care, The Lancet Diabetes & Endocrinology, Journal of the American Geriatrics Society, JAMA Network Open, and Epilepsia. This distribution illustrates a focus on diabetes and associated neurological and metabolic conditions.

Best Publications

  • Diabetes and cognitive dysfunction.

    Rory J McCrimmon;Christopher M Ryan;Brian M Frier

  • Cognition and diabetes: a lifespan perspective.

    Geert Jan Biessels;Ian J Deary;Christopher M Ryan

  • Hierarchy of glycemic thresholds for counterregulatory hormone secretion, symptoms, and cerebral dysfunction

    A. Mitrakou;C. Ryan;T. Veneman;M. Mokan

  • Long-term effect of diabetes and its treatment on cognitive function.

    Diabetes Control;Complications Trial

  • Cognitive Deficits in Adolescents Who Developed Diabetes Early in Life

    Christopher Ryan;Arthur Vega;Allan Drash

  • A hindi version of the MMSE: The development of a cognitive screening instrument for a largely illiterate rural elderly population in india

    Mary Ganguli;Graham Ratcliff;Vijay Chandra;Vijay Chandra;Sujatha Sharma

  • Adherence in chronic disease.

    J Dunbar-Jacob;J A Erlen;E A Schlenk;C M Ryan

  • Prolonged effect of intensive therapy on the risk of retinopathy complications in patients with type 1 diabetes mellitus: 10 years after the diabetes control and complications trial

    Neil H. White;Wanjie Sun;Patricia A. Cleary;Ronald P. Danis

  • Cognitive impairment associated with adjuvant therapy in breast cancer.

    Catherine M. Bender;Susan M. Sereika;Sarah L. Berga;Victor G. Vogel

  • Effects of Type 1 Diabetes on Gray Matter Density as Measured by Voxel-Based Morphometry

    Gail Musen;In Kyoon Lyoo;Caitlin R. Sparks;Katie Weinger

  • Improving metabolic control leads to better working memory in adults with type 2 diabetes.

    Christopher M. Ryan;Martin I. Freed;Julie A. Rood;Alexander R. Cobitz

  • Effects of lovastatin on cognitive function and psychological well-being ∗

    Matthew F Muldoon;Steven D Barger;Christopher M Ryan;Janine D Flory

  • Prenatal alcohol and marijuana exposure: Effects on neuropsychological outcomes at 10 years

    Gale A Richardson;Christopher Ryan;Jennifer Willford;Nancy L Day

  • Cognitive efficiency declines over time in adults with Type 1 diabetes: effects of micro- and macrovascular complications.

    C. M. Ryan;M. O. Geckle;T. J. Orchard

  • Randomized trial of the effects of simvastatin on cognitive functioning in hypercholesterolemic adults

    Matthew F. Muldoon;Christopher M. Ryan;Susan M. Sereika;Janine D. Flory

  • Psychological and cognitive function: predictors of adherence with cholesterol lowering treatment.

    Carol S. Stilley;Susan Sereika;Matthew F. Muldoon;Christopher M. Ryan

  • The impact of cognitive function on medication management: three studies.

    Carol S. Stilley;Catherine M. Bender;Jacqueline Dunbar-Jacob;Susan Sereika

  • Neuropsychological correlates of hypertension: review and methodologic considerations.

    Shari R. Waldstein;Stephen B. Manuck;Christopher M. Ryan;Matthew F. Muldoon

  • Why is learning and memory dysfunction in Type 2 diabetes limited to older adults

    Christopher M. Ryan;Michelle Geckle

  • Prevention of Hypoglycemia During Exercise in Children With Type 1 Diabetes by Suspending Basal Insulin

    Eva Tsalikian;Larry Fox;Kathleen F. Janz;Darrell Wilson

Frequent Co-Authors

Matthew F. Muldoon
Matthew F. Muldoon University of Pittsburgh
Susan M. Sereika
Susan M. Sereika University of Pittsburgh
Stephen B. Manuck
Stephen B. Manuck University of Pittsburgh
Trevor J. Orchard
Trevor J. Orchard University of Pittsburgh
J. Richard Jennings
J. Richard Jennings University of Pittsburgh
Dorothy J. Becker
Dorothy J. Becker University of Pittsburgh
In Kyoon Lyoo
In Kyoon Lyoo Ewha Womans University
Caterina Rosano
Caterina Rosano University of Pittsburgh
Perry F. Renshaw
Perry F. Renshaw University of Utah
Adam Brufsky
Adam Brufsky University of Pittsburgh

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