World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 81 16496 15515 180 171 343 28244

Niels Keiding publications per year

The chart shows the history of publications by Niels Keiding between 1952 and 2022, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Niels Keiding published across 71 years, from 1952 to 2022, averaging 5.7 papers a year. Output peaked at 22 publications in 2009. 5 of the 407 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1952 to 2022. Vertical axis: number of publications, 0 to 22. Peak 22 publications in 2009. 1952: 2 publications 1953: 0 publications 1954: 1 publication 1955: 0 publications 1956: 0 publications 1957: 1 publication 1958: 0 publications 1959: 1 publication 1960: 0 publications 1961: 0 publications 1962: 1 publication 1963: 0 publications 1964: 1 publication 1965: 0 publications 1966: 1 publication 1967: 0 publications 1968: 0 publications 1969: 1 publication 1970: 0 publications 1971: 0 publications 1972: 1 publication 1973: 1 publication 1974: 5 publications 1975: 4 publications 1976: 1 publication 1977: 3 publications 1978: 3 publications 1979: 0 publications 1980: 0 publications 1981: 2 publications 1982: 7 publications 1983: 2 publications 1984: 1 publication 1985: 6 publications 1986: 5 publications 1987: 9 publications 1988: 5 publications 1989: 6 publications 1990: 16 publications 1991: 10 publications 1992: 4 publications 1993: 15 publications 1994: 7 publications 1995: 18 publications 1996: 5 publications 1997: 11 publications 1998: 15 publications 1999: 12 publications 2000: 9 publications 2001: 14 publications 2002: 14 publications 2003: 13 publications 2004: 15 publications 2005: 12 publications 2006: 18 publications 2007: 8 publications 2008: 9 publications 2009: 22 publications 2010: 11 publications 2011: 7 publications 2012: 13 publications 2013: 11 publications 2014: 16 publications 2015: 7 publications 2016: 10 publications 2017: 1 publication 2018: 4 publications 2019: 4 publications 2020: 1 publication 2021: 3 publications 2022: 2 publications
1952 2022

407 publications in total across all disciplines

View publications per year as a table
Niels Keiding: publications per year, 1952 to 2022
Year Publications
1952 2
1953 0
1954 1
1955 0
1956 0
1957 1
1958 0
1959 1
1960 0
1961 0
1962 1
1963 0
1964 1
1965 0
1966 1
1967 0
1968 0
1969 1
1970 0
1971 0
1972 1
1973 1
1974 5
1975 4
1976 1
1977 3
1978 3
1979 0
1980 0
1981 2
1982 7
1983 2
1984 1
1985 6
1986 5
1987 9
1988 5
1989 6
1990 16
1991 10
1992 4
1993 15
1994 7
1995 18
1996 5
1997 11
1998 15
1999 12
2000 9
2001 14
2002 14
2003 13
2004 15
2005 12
2006 18
2007 8
2008 9
2009 22
2010 11
2011 7
2012 13
2013 11
2014 16
2015 7
2016 10
2017 1
2018 4
2019 4
2020 1
2021 3
2022 2
Total 407
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Niels Keiding 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 Niels Keiding 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, 341–360 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: 343 publications — 26th percentile

26% 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
341–360 922 343
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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Niels Keiding 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 Niels Keiding 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, 80–81 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: 81 D-Index — 19th percentile

19% 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 81
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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Research.com Recognitions

  • 2010 - Member of Academia Europaea

Overview

Niels Keiding is affiliated with the University of Copenhagen in Denmark, focusing primarily on research within the field of Medicine. Their main research interests span a variety of subfields, including Immunology, Reproductive Medicine, Gender Studies, Pediatrics, Perinatology and Child Health, and Hematology.

The scientist's work frequently appears in notable publication venues such as Epidemiology, Journal of Affective Disorders, European Journal of Haematology, eJHaem, and Wiley StatsRef: Statistics Reference Online.

Key topics addressed in their research include Reproductive Health and Technologies, Demographic Trends and Gender Preferences, Assisted Reproductive Technology and Twin Pregnancy, Hematopoietic Stem Cell Transplantation, Immune Cell Function and Interaction, Maternal and Perinatal Health Interventions, and Global Healthcare and Medical Tourism.

Selected recent papers authored or co-authored by Niels Keiding highlight contributions across these areas:

  • The Use of Time to Pregnancy for Estimating and Monitoring Human Fecundity From Demographic and Health Surveys (2020, Epidemiology)
  • Is cesarean section a cause of affective disorders?-A national cohort study using sibling designs (2020, Journal of Affective Disorders)
  • High preharvest donor Foxp3 mRNA level predicts late relapse of acute lymphoblastic leukaemia after haematopoietic stem cell transplantation (2021, European Journal Of Haematology)
  • Higher recipient pre-transplant FOXP3 mRNA expression is associated with acute leukaemia relapse after HSCT (2022, eJHaem)
  • The Authors Respond (2021, Epidemiology)

The scientist collaborates regularly with frequent co-authors, including Mohamed M. Ali, Frank Eriksson, Thabo Matsaseng, Igor Toskin, and James Kiarie, indicating active engagement in multi-author studies.

In recognition of their academic engagement, Niels Keiding was named a Member of Academia Europaea in 2010.

Best Publications

  • Evidence for Decreasing Quality of Semen During Past 50 Years

    Elisabeth Carlsen;Aleksander Giwercman;Niels Keiding;Niels E. Skakkebaek

  • Male reproductive health and environmental xenoestrogens

    J Toppari;JC Larsen;P Christiansen;A Giwercman

  • Multi-state models for event history analysis

    Per Kragh Andersen;Niels Keiding

  • Thrombotic Stroke and Myocardial Infarction with Hormonal Contraception

    Øjvind Lidegaard;Aksel Jensen;Charlotte Wessel Skovlund;Niels Keiding

  • Regional differences in semen quality in Europe.

    Niels Jørgensen;Anne-Grethe Andersen;Florence Eustache;D. Stewart Irvine

  • Age-Specific Incidence and Prevalence: A Statistical Perspective

    Niels Keiding

  • Neurobehavioral deficits associated with PCB in 7-year-old children prenatally exposed to seafood neurotoxicants.

    Philippe Grandjean;Pal Weihe;Virlyn W. Burse;Larry L. Needham

  • High frequency of sub-optimal semen quality in an unselected population of young men

    A G Andersen;Tina Kold Jensen;E Carlsen;N Jørgensen

  • Thrombotic Stroke and Myocardial Infarction With Hormonal Contraception

    Øjvind Lidegaard;Ellen Løkkegaard;Aksel Jensen;Charlotte Wessel Skovlund

  • Evidence for increasing incidence of abnormalities of the human testis: a review.

    Aleksander Giwercman;Elisabeth Carlsen;Niels Keiding;Niels E. Skakkebaek

  • Time to pregnancy and semen parameters: a cross-sectional study among fertile couples from four European cities

    R. Slama;F. Eustache;B. Ducot;T.K. Jensen

  • Association of In Utero Exposure to Maternal Smoking with Reduced Semen Quality and Testis Size in Adulthood: A Cross-Sectional Study of 1,770 Young Men from the General Population in Five European Countries

    Tina Kold Jensen;Niels Jørgensen;Margus Punab;Trine B. Haugen

  • Depression as a prognostic factor for breast cancer mortality.

    Karen Hjerl;Elisabeth Wreford Andersen;Niels Keiding;Henning T. Mouridsen

  • Statistical methods for the analysis and presentation of the results of bone marrow transplants. Part I: unadjusted analysis.

    J P Klein;J D Rizzo;M J Zhang;N Keiding

  • The role of frailty models and accelerated failure time models in describing heterogeneity due to omitted covariates

    Niels Keiding;Per Kragh Andersen;John P. Klein

  • The association between early menopause and risk of ischaemic heart disease: influence of Hormone Therapy.

    E. Løkkegaard;Z. Jovanovic;B.L. Heitmann;N. Keiding

  • Risk of Acute Nonlymphocytic Leukemia and Preleukemia in Patients Treated with Cyclophosphamide for Non-Hodgkin's Lymphomas: Comparison with Results Obtained in Patients Treated for Hodgkin's Disease and Ovarian Carcinoma with Other Alkylating Agents

    Jens Pedersen-Bjergaard;Jens Ersbøll;Hilda Mygind Sørensen;Niels Keiding

  • Unemployment and mortality in Denmark, 1970-80.

    L Iversen;O Andersen;P K Andersen;K Christoffersen

  • Statistical methods for the analysis and presentation of the results of bone marrow transplants. Part 2: Regression modeling.

    J P Klein;J D Rizzo;M J Zhang;N Keiding

  • Evidence fordecreasing quality ofsemen during past50years

    Elisabeth Carlsen;Aleksander Giwercman;Niels Keiding;Niels ESkakkeblek

Frequent Co-Authors

Per Kragh Andersen
Per Kragh Andersen University of Copenhagen
Philippe Grandjean
Philippe Grandjean University of Southern Denmark
Niels E. Skakkebæk
Niels E. Skakkebæk University of Copenhagen
Tina Kold Jensen
Tina Kold Jensen University of Southern Denmark
Richard D. Gill
Richard D. Gill Leiden University
Ørnulf Borgan
Ørnulf Borgan University of Oslo
Pál Weihe
Pál Weihe University of the Faroe Islands
Niels Jørgensen
Niels Jørgensen University of Copenhagen
John P. Klein
John P. Klein Medical College of Wisconsin
Allan Krasnik
Allan Krasnik University of Copenhagen

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