World's Best Scientists 2026 revealed!

D-Index & Metrics

Social Sciences and Humanities

D-Index
50
Citations
10164
World Ranking
2764
National Ranking
1339

Andrew M. Ryan publication distribution in Social Sciences and Humanities in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Social Sciences and Humanities in 2026. The highlighted bar marks where Andrew M. Ryan sits on this spectrum.

44–53 publications: 28 scientists 54–63 publications: 61 scientists 64–73 publications: 161 scientists 74–83 publications: 225 scientists 84–93 publications: 301 scientists 94–103 publications: 390 scientists 104–113 publications: 406 scientists 114–123 publications: 474 scientists 124–133 publications: 453 scientists 134–143 publications: 434 scientists 144–153 publications: 407 scientists 154–163 publications: 411 scientists 164–173 publications: 391 scientists 174–183 publications: 313 scientists 184–193 publications: 319 scientists 194–203 publications: 304 scientists 204–213 publications: 285 scientists 214–223 publications: 246 scientists 224–233 publications: 213 scientists 234–243 publications: 170 scientists 244–253 publications: 167 scientists 254–263 publications: 162 scientists 264–273 publications: 138 scientists 274–283 publications: 138 scientists 284–293 publications: 113 scientists 294–303 publications: 106 scientists 304–313 publications: 95 scientists 314–323 publications: 101 scientists 324–333 publications: 81 scientists 334–343 publications: 69 scientists 344–353 publications: 56 scientists 354–363 publications: 36 scientists 364–373 publications: 42 scientists 374–383 publications: 41 scientists 384–393 publications: 44 scientists 394–403 publications: 27 scientists 404–413 publications: 30 scientists 414–423 publications: 20 scientists 424–433 publications: 29 scientists 434–443 publications: 29 scientists 444–453 publications: 25 scientists 454–463 publications: 19 scientists 464–473 publications: 21 scientists 474–483 publications: 11 scientists 484–493 publications: 17 scientists 494–503 publications: 7 scientists 504–513 publications: 6 scientists 514–523 publications: 12 scientists 524–533 publications: 10 scientists 534–543 publications: 7 scientists 544–553 publications: 6 scientists 554–563 publications: 12 scientists 564–569 publications: 8 scientists 570+ publications: 100 scientists
44 publications 570+

This scientist: 215 publications — 70th percentile

70% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 570 publications or more.

Andrew M. Ryan D-index placement in Social Sciences and Humanities in 2026

The chart shows the D-index (discipline H-index) distribution of Social Sciences and Humanities scientists ranked by Research.com in 2026. The highlighted bar marks where Andrew M. Ryan sits on this spectrum.

30 D-Index: 177 scientists 31 D-Index: 210 scientists 32 D-Index: 222 scientists 33 D-Index: 188 scientists 34 D-Index: 181 scientists 35 D-Index: 243 scientists 36 D-Index: 261 scientists 37 D-Index: 272 scientists 38 D-Index: 278 scientists 39 D-Index: 300 scientists 40 D-Index: 297 scientists 41 D-Index: 308 scientists 42 D-Index: 313 scientists 43 D-Index: 300 scientists 44 D-Index: 269 scientists 45 D-Index: 260 scientists 46 D-Index: 228 scientists 47 D-Index: 251 scientists 48 D-Index: 203 scientists 49 D-Index: 186 scientists 50 D-Index: 187 scientists 51 D-Index: 166 scientists 52 D-Index: 138 scientists 53 D-Index: 141 scientists 54 D-Index: 131 scientists 55 D-Index: 137 scientists 56 D-Index: 109 scientists 57 D-Index: 129 scientists 58 D-Index: 95 scientists 59 D-Index: 105 scientists 60 D-Index: 106 scientists 61 D-Index: 86 scientists 62 D-Index: 94 scientists 63 D-Index: 77 scientists 64 D-Index: 79 scientists 65 D-Index: 59 scientists 66 D-Index: 68 scientists 67 D-Index: 51 scientists 68 D-Index: 49 scientists 69 D-Index: 40 scientists 70 D-Index: 43 scientists 71 D-Index: 40 scientists 72 D-Index: 50 scientists 73 D-Index: 46 scientists 74 D-Index: 43 scientists 75 D-Index: 45 scientists 76 D-Index: 45 scientists 77 D-Index: 30 scientists 78 D-Index: 25 scientists 79 D-Index: 31 scientists 80 D-Index: 29 scientists 81 D-Index: 18 scientists 82 D-Index: 21 scientists 83 D-Index: 26 scientists 84 D-Index: 15 scientists 85 D-Index: 15 scientists 86 D-Index: 19 scientists 87 D-Index: 19 scientists 88 D-Index: 12 scientists 89 D-Index: 7 scientists 90 D-Index: 19 scientists 91 D-Index: 20 scientists 92 D-Index: 13 scientists 93 D-Index: 9 scientists 94 D-Index: 13 scientists 95 D-Index: 8 scientists 96 D-Index: 7 scientists 97 D-Index: 6 scientists 98 D-Index: 6 scientists 99 D-Index: 6 scientists 100+ D-Index: 97 scientists
30 D-Index 100+

This scientist: 50 D-Index — 66th percentile

66% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 100 D-Index or more.

Overview

Andrew M. Ryan is affiliated with the University of Michigan-Ann Arbor in the United States. Their research spans multiple fields primarily focused on healthcare policy, economics, and clinical outcomes.

Their main fields of study include:

  • Economics, Econometrics and Finance
  • Health Professions
  • Medicine

Their subfields of study highlight a focus on:

  • Economics and Econometrics
  • General Health Professions
  • Surgery
  • Pulmonary and Respiratory Medicine
  • Emergency Medicine

Key research topics covered in their work include:

  • Healthcare Policy and Management
  • Primary Care and Health Outcomes
  • Health Systems, Economic Evaluations, Quality of Life
  • Patient Satisfaction in Healthcare
  • Global Health Care Issues
  • Bariatric Surgery and Outcomes
  • Healthcare cost, quality, practices

Frequent publication venues where they have contributed include:

  • Health Affairs
  • JAMA Health Forum
  • JAMA
  • Annals of Surgery
  • Health Services Research

Frequent coauthors in their research collaborations are:

  • Justin B. Dimick
  • Karan R. Chhabra
  • David J. Meyers
  • John M. Hollingsworth
  • Grace F. Chao

Selected recent papers authored or coauthored by Andrew M. Ryan include:

  • Use of Telehealth by Surgical Specialties During the COVID-19 Pandemic, 2021, JAMA Surgery
  • Comparative Safety of Sleeve Gastrectomy and Gastric Bypass Up to 5 Years After Surgery in Patients With Severe Obesity, 2021, JAMA Surgery
  • Out-of-Network Bills for Privately Insured Patients Undergoing Elective Surgery With In-Network Primary Surgeons and Facilities, 2020, JAMA
  • Access to Mechanical Thrombectomy for Ischemic Stroke in the United States, 2021, Stroke
  • Predicting 30-day hospital readmissions using artificial neural networks with medical code embedding, 2020, PLoS ONE

Best Publications

  • Methods for evaluating changes in health care policy: the difference-in-differences approach.

    Justin B. Dimick;Andrew M. Ryan

  • Self-Reported Discrimination and Mental Health Status Among African Descendants, Mexican Americans, and Other Latinos in the New Hampshire REACH 2010 Initiative: The Added Dimension of Immigration

    Gilbert C. Gee;Andrew Ryan;David J. Laflamme;Jeanie Holt

  • Why We Should Not Be Indifferent to Specification Choices for Difference-in-Differences.

    Andrew M. Ryan;James F. Burgess;M.P.H. Justin B. Dimick M.D.

  • Association of hospital participation in a quality reporting program with surgical outcomes and expenditures for Medicare beneficiaries.

    Nicholas H. Osborne;Lauren H. Nicholas;Andrew M. Ryan;Jyothi R. Thumma

  • Sensitivity of transvaginal ultrasound screening for endometrial cancer in postmenopausal women: a case-control study within the UKCTOCS cohort

    Ian Jacobs;Aleksandra Gentry-Maharaj;Matthew Burnell;Ranjit Manchanda

  • Association of caesarean delivery with child adiposity from age 6 weeks to 15 years.

    Jan Blustein;Teresa Attina;Mengling Liu;Andrew M. Ryan

  • Bariatric Surgery Complications Before vs After Implementation of a National Policy Restricting Coverage to Centers of Excellence

    Justin B. Dimick;Lauren H. Nicholas;Andrew M. Ryan;Jyothi R. Thumma

  • The Association between Self-Reported Discrimination, Physical Health and Blood Pressure: Findings from African Americans, Black Immigrants, and Latino Immigrants in New Hampshire

    Andrew M. Ryan;Gilbert C. Gee;David F. Laflamme

  • Current State of Value-Based Purchasing Programs

    Tingyin T. Chee;Andrew M. Ryan;Jason H. Wasfy;William B. Borden

  • Long-term evidence for the effect of pay-for-performance in primary care on mortality in the UK: a population study

    Andrew Ryan;Sam Krinsky;Evangelos Kontopantelis;Evangelos Kontopantelis;Timothy Doran

  • Effects of the Premier Hospital Quality Incentive Demonstration on Medicare patient mortality and cost.

    Andrew M. Ryan

  • Changes in Hospital Quality Associated with Hospital Value-Based Purchasing

    Andrew M. Ryan;Sam Krinsky;Kristin A. Maurer;Justin B. Dimick

  • Association of Coded Severity With Readmission Reduction After the Hospital Readmissions Reduction Program.

    Andrew M. Ibrahim;Justin B. Dimick;Shashank S. Sinha;John M. Hollingsworth

  • Use of Telehealth by Surgical Specialties during the COVID-19 Pandemic

    Grace F. Chao;Kathleen Y. Li;Ziwei Zhu;Jeff McCullough

  • Association of intensive care unit admission with mortality among older patients with pneumonia

    Thomas S Valley;Michael W Sjoding;Andrew M Ryan;Theodore John Iwashyna

  • Now trending: Coping with non-parallel trends in difference-in-differences analysis:

    Andrew M Ryan;Evangelos Kontopantelis;Ariel Linden;James F Burgess

  • Estimating causal effects for multivalued treatments: A comparison of approaches

    Ariel Linden;S. Derya Uysal;Andrew Ryan;John L. Adams

  • Medicare’s Public Reporting Initiative On Hospital Quality Had Modest Or No Impact On Mortality From Three Key Conditions

    Andrew M. Ryan;Brahmajee K. Nallamothu;Justin B. Dimick

  • Small Primary Care Physician Practices Have Low Rates Of Preventable Hospital Admissions

    Lawrence P. Casalino;Michael F. Pesko;Andrew M. Ryan;Jayme L. Mendelsohn

  • Prevalence, frequency and problem rating of hot flushes persist in older postmenopausal women: impact of age, body mass index, hysterectomy, hormone therapy use, lifestyle and mood in a cross‐sectional cohort study of 10 418 British women aged 54–65

    Hunter;A Gentry-Maharaj;A Ryan;M Burnell

  • Vertical Integration of Hospitals and Physicians: Economic Theory and Empirical Evidence on Spending and Quality.

    Brady Post;Tom Buchmueller;Andrew M. Ryan

  • The Early Effects of Medicare's Mandatory Hospital Pay-for-Performance Program

    Andrew M. Ryan;James F. Burgess;Michael F. Pesko;M.P.H. William B. Borden M.D.

  • Impact of Provider Incentives on Quality and Value of Health Care

    Timothy Doran;Kristin A Maurer;Andrew M Ryan

Frequent Co-Authors

Justin B. Dimick
Justin B. Dimick University of Michigan–Ann Arbor
Ian Jacobs
Ian Jacobs University of New South Wales
Usha Menon
Usha Menon University College London
Brahmajee K. Nallamothu
Brahmajee K. Nallamothu University of Michigan–Ann Arbor
Christopher M. Hovens
Christopher M. Hovens University of Melbourne
Edward C. Norton
Edward C. Norton University of Michigan–Ann Arbor
Julia Adler-Milstein
Julia Adler-Milstein University of California, San Francisco
Mahesh K. B. Parmar
Mahesh K. B. Parmar University College London
Stephen M. Shortell
Stephen M. Shortell University of California, Berkeley
Lesley Fallowfield
Lesley Fallowfield University of Sussex

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