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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 77 18533 17412 359 335 318 18797

Niklas Hammar publications per year

The chart shows the history of publications by Niklas Hammar between 1982 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Niklas Hammar published across 45 years, from 1982 to 2026, averaging 7.7 papers a year. Output peaked at 28 publications in 2018. 9 of the 345 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1982 to 2026. Vertical axis: number of publications, 0 to 28. Peak 28 publications in 2018. 1982: 2 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 1 publication 1988: 0 publications 1989: 0 publications 1990: 1 publication 1991: 3 publications 1992: 3 publications 1993: 2 publications 1994: 2 publications 1995: 1 publication 1996: 3 publications 1997: 3 publications 1998: 6 publications 1999: 1 publication 2000: 6 publications 2001: 6 publications 2002: 9 publications 2003: 14 publications 2004: 7 publications 2005: 6 publications 2006: 6 publications 2007: 8 publications 2008: 7 publications 2009: 15 publications 2010: 11 publications 2011: 12 publications 2012: 20 publications 2013: 8 publications 2014: 9 publications 2015: 15 publications 2016: 14 publications 2017: 24 publications 2018: 28 publications 2019: 19 publications 2020: 11 publications 2021: 19 publications 2022: 9 publications 2023: 16 publications 2024: 9 publications 2025: 8 publications 2026: 1 publication
1982 2026

345 publications in total across all disciplines

View publications per year as a table
Niklas Hammar: publications per year, 1982 to 2026
Year Publications
1982 2
1983 0
1984 0
1985 0
1986 0
1987 1
1988 0
1989 0
1990 1
1991 3
1992 3
1993 2
1994 2
1995 1
1996 3
1997 3
1998 6
1999 1
2000 6
2001 6
2002 9
2003 14
2004 7
2005 6
2006 6
2007 8
2008 7
2009 15
2010 11
2011 12
2012 20
2013 8
2014 9
2015 15
2016 14
2017 24
2018 28
2019 19
2020 11
2021 19
2022 9
2023 16
2024 9
2025 8
2026 1
Total 345
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Niklas Hammar publications per year - data summary

  • Niklas Hammar, a Medicine scholar from Karolinska Institute, has 345 publications recorded across 45 years, from 1982 to 2026.
  • The oldest publication on record dates to 1982 and the most recent to 2026.
  • The most productive year is 2018, with 28 publications.
  • The least productive years with any output are 1987, 1990, 1995, 1999 and others, with 1 publication each.
  • 6 of the 45 years in the span carry no publications at all (1983, 1984, 1985, 1986 and others).
  • The rate of publication averages 7.7 papers per year over the whole span, or 8.8 per year counting only the 39 years with at least one publication.
  • The last 5 years on the chart (2022-2026) hold 43 publications, 12% of the career total.
  • Split into equal eras - 1982-1996: 18 publications (1.2 per year); 1997-2011: 117 publications (7.8 per year); 2012-2026: 210 publications (14.0 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Niklas Hammar 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 Niklas Hammar 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, 301–320 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: 318 publications — 21st percentile

21% 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
301–320 834 318
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
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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Niklas Hammar 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.
  • Niklas Hammar, a Medicine scholar from Karolinska Institute, records 318 publications - the 21st percentile of the discipline.
  • 21% of ranked Medicine scientists score the same or lower than Niklas Hammar, and about 79% score higher.
  • The median of the discipline falls in the 441–460 publications range, and Niklas Hammar ranks below 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).

Niklas Hammar 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 Niklas Hammar 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, 76–77 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: 77 D-Index — 10th percentile

10% 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 77
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
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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Niklas Hammar 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.
  • Niklas Hammar, a Medicine scholar from Karolinska Institute, records 77 D-Index - the 10th percentile of the discipline.
  • 10% of ranked Medicine scientists score the same or lower than Niklas Hammar, and about 90% score higher.
  • The median of the discipline falls in the 94–95 D-Index range, and Niklas Hammar ranks below 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

Niklas Hammar is affiliated with the Karolinska Institute in Sweden and has an extensive publication record focused primarily on medicine. Their research spans several subfields including endocrinology, diabetes and metabolism, epidemiology, cardiology and cardiovascular medicine, hepatology, and molecular biology.

Hammar's recent published papers cover a variety of topics related to liver disease, metabolic disorders, cancer, and epidemiology. Notable publications include:

  • Repeated FIB-4 measurements can help identify individuals at risk of severe liver disease, 2020, Journal of Hepatology
  • Metabolic Profile and Long-Term Risk of Depression, Anxiety, and Stress-Related Disorders, 2024, JAMA Network Open
  • Tumor-Infiltrating B Lymphocyte Profiling Identifies IgG-Biased, Clonally Expanded Prognostic Phenotypes in Triple-Negative Breast Cancer, 2021, Cancer Research
  • Swedish Covid-19 Investigation for Future Insights - A Population Epidemiology Approach Using Register Linkage (SCIFI-PEARL), 2021, Clinical Epidemiology
  • Long-term risk of a major cardiovascular event by apoB, apoA-1, and the apoB/apoA-1 ratio-Experience from the Swedish AMORIS cohort: A cohort study, 2021, PLoS Medicine

Frequent co-authors in Hammar's work include Göran Walldius, Hannes Hagström, Mats Talbäck, Kamlesh Khunti, and Hungta Chen.

Hammar's research contributions are often published in journals such as the Journal of Hepatology, Diabetes Research and Clinical Practice, Diabetes Obesity and Metabolism, PLoS Medicine, and GeroScience.

The scientist's work covers key topics including:

  • Diabetes Treatment and Management
  • Liver Disease Diagnosis and Treatment
  • Diabetes Management and Research
  • Metabolism, Diabetes, and Cancer
  • Diabetes, Cardiovascular Risks, and Lipoproteins
  • Liver Disease and Transplantation
  • Diabetes and associated disorders

In total, Hammar has contributed to 148 publications in medicine, with a notable focus on 41 publications in endocrinology, diabetes and metabolism and 23 in epidemiology. Their work also includes 14 publications each in cardiology and cardiovascular medicine, hepatology, and molecular biology.

Best Publications

  • The new Swedish Prescribed Drug Register—Opportunities for pharmacoepidemiological research and experience from the first six months

    Björn Wettermark;Björn Wettermark;Niklas Hammar;Niklas Hammar;C. MichaelFored;Andrejs Leimanis

  • Lower Risk of Heart Failure and Death in Patients Initiated on Sodium-Glucose Cotransporter-2 Inhibitors Versus Other Glucose-Lowering Drugs: The CVD-REAL Study (Comparative Effectiveness of Cardiovascular Outcomes in New Users of Sodium-Glucose Cotransporter-2 Inhibitors).

    Mikhail Kosiborod;Matthew A. Cavender;Alex Z. Fu;John P. Wilding

  • Stroke in paroxysmal atrial fibrillation: report from the Stockholm Cohort of Atrial Fibrillation.

    Leif Friberg;Niklas Hammar;Niklas Hammar;Mårten Rosenqvist

  • Cardiovascular Events Associated With SGLT-2 Inhibitors Versus Other Glucose-Lowering Drugs: The CVD-REAL 2 Study

    Mikhail Kosiborod;Carolyn S.P. Lam;Shun Kohsaka;Dae Jung Kim;Dae Jung Kim

  • High effort, low reward, and cardiovascular risk factors in employed Swedish men and women: baseline results from the WOLF Study.

    Richard Peter;Lars Alfredsson;Niklas Hammar;Johannes Siegrist

  • Uric acid and risk of myocardial infarction, stroke and congestive heart failure in 417,734 men and women in the Apolipoprotein MOrtality RISk study (AMORIS).

    I. Holme;A. H. Aastveit;N. Hammar;N. Hammar;I. Jungner

  • Alcohol consumption and type 2 diabetes Meta-analysis of epidemiological studies indicates a U-shaped relationship.

    S. Carlsson;S. Carlsson;N. Hammar;N. Hammar;V. Grill

  • Therapeutic inertia in the treatment of hyperglycaemia in patients with type 2 diabetes: A systematic review.

    Kamlesh Khunti;Marilia B. Gomes;Stuart Pocock;Marina V. Shestakova

  • A national record linkage to study acute myocardial infarction incidence and case fatality in Sweden.

    Niklas Hammar;Lars Alfredsson;Mans Rosen;Curt-Lennart Spetz

  • Stroke prophylaxis in atrial fibrillation: who gets it and who does not? Report from the Stockholm Cohort-study on Atrial Fibrillation (SCAF-study).

    Leif Friberg;Niklas Hammar;Niklas Hammar;Mattias Ringh;Hans Pettersson

  • Alcohol consumption and the incidence of type 2 diabetes: a 20-year follow-up of the Finnish twin cohort study.

    Sofia Carlsson;Niklas Hammar;Valdemar Grill;Jaakko Kaprio

  • Sex differences in survival after myocardial infarction in Sweden. Data from the Swedish National Acute Myocardial Infarction register

    A Rosengren;C L Spetz;M Köster;N Hammar

  • Coffee consumption, type 2 diabetes and impaired glucose tolerance in Swedish men and women.

    E. E. Agardh;S. Carlsson;A. A. Ahlbom;S. Efendic

  • Vascular complications in patients with type 2 diabetes: prevalence and associated factors in 38 countries (the DISCOVER study program)

    Mikhail Kosiborod;Marilia B Gomes;Antonio Nicolucci;Stuart Pocock

  • Incidence of cancer among Nordic airline pilots over five decades: occupational cohort study

    Eero Pukkala;Rafael Aspholm;Anssi Auvinen;Harald Eliasch

  • Incidence of urinary tract infection among patients with type 2 diabetes in the UK General Practice Research Database (GPRD)

    Ishan Hirji;Zhenchao Guo;Susan W. Andersson;Niklas Hammar

  • Increased mortality in paroxysmal atrial fibrillation: report from the Stockholm Cohort-Study of Atrial Fibrillation (SCAF)

    Leif Friberg;Niklas Hammar;Niklas Hammar;Hans Pettersson;Mårten Rosenqvist

  • Job strain, social support at work, and incidence of myocardial infarction.

    Niklas Hammar;Lars Alfredsson;Jeffrey V. Johnson

  • Mortality from Cancer and Other Causes among Airline Cabin Attendants in Europe: A Collaborative Cohort Study in Eight Countries

    Hajo Zeeb;Maria Blettner;Ingo Langner;Gaël P. Hammer

  • Blood biomarkers of carbohydrate, lipid, and apolipoprotein metabolisms and risk of amyotrophic lateral sclerosis: A more than 20-year follow-up of the Swedish AMORIS cohort.

    Daniela Mariosa;Niklas Hammar;Håkan Malmström;Caroline Ingre

Frequent Co-Authors

Lars Holmberg
Lars Holmberg King's College London
Mats Lambe
Mats Lambe Karolinska Institute
Mikhail Kosiborod
Mikhail Kosiborod University of Missouri–Kansas City
Lars Alfredsson
Lars Alfredsson Karolinska Institute
Kamlesh Khunti
Kamlesh Khunti University of Leicester
Anders Ahlbom
Anders Ahlbom Karolinska Institute
Jaakko Kaprio
Jaakko Kaprio University of Helsinki
Stuart J. Pocock
Stuart J. Pocock London School of Hygiene & Tropical Medicine
Iichiro Shimomura
Iichiro Shimomura Osaka University
Hirotaka Watada
Hirotaka Watada Juntendo University

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