2020 Journal Citation Reports for Endocrine Society Journals
Memo Prepared by Endocrine Society Publishing Staff, June 30, 2021
Journal Citation Reports (JCR) is an annual publication by Clarivate Analytics. JCR uses the citation activity of scholarly journals, as indexed in Clarivate’s Web of Science, in order to devise annual journal- level metrics. These metrics include the Journal Impact Factor, Immediacy Index, and Cited Half-Life.
The 2020 JCR results were publicly released on June 30, 2021.
Definition of the scores
The Journal Impact Factor looks at the articles a journal published over two years and averages the number of citations those articles received in the third year.
The 2020 Journal Impact Factor, as a calculation:
Number of citations in 2020 to the journal for its articles published in 2018 and 2019 Number of citable articles published in 2018 and 2019
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The Immediacy Index looks at the number of articles published in a single year and averages their resulting citations within the same year.
The 2020 Immediacy Index, as a calculation:
Number of citations in 2020 to the journal for its articles published in 2020 Number of citable articles published in 2020
Citable means scientific content. Clarivate indexes all journals individually and rules out items that are not seen as regular, editorial material. Items eliminated from the denominators above include editorials, errata, publisher’s notices, conference proceedings, meeting abstracts, and correspondence (letters to the editor and their responses).
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The Cited Half-Life refers to the median age of articles cited in the given year. It measures citations in only one year, but it looks at the age of every article that is cited. The cited half-life means that half of the articles cited within the year are older than the score in number of years, and half are younger.
Example: a Cited Half-Life of 10 in 2020 means that half the journal’s articles cited in 2020 were published in or prior to 10 years ago, and half were published within 10 years of 2020.
Another way to look at it is to say that in 2020, with a Cited Half-Life of 10, a journal’s average article is likely to reach its peak in citations in 10 years but also to continue receiving citations 10 years after that, for a total citation life of 20 years. However, it is an average and measured only by one year’s activity. The metric is likely to change every year, if only slightly.
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None of these are perfect measurements, and many publishers argue against relying on them unilaterally. Journals vary by practice and scientific specialty, and each practice and specialty has a different average rate of citations. Also, journal types vary. Review journals tend to have higher Journal Impact Factors than clinical journals, which tend to have higher Journal Impact Factors than basic science journals. Megajournals, especially ones with high acceptance rates, do not tend to publicize the Journal Impact Factor because theirs tend to be low as a result of the volume of content being published, much of which doesn’t get cited at all or immediately.
High-publicity journals with a brand awareness transcending a single practice or specialty, especially one of a moderate or small size, will perform more successfully than one with a narrow specialty, even if that narrow journal is well regarded internationally.
Clarivate also accounts for journals’ self-citations (an article citing another article in the same journal), displaying statistics and offering an alternative Journal Impact Factor without them.
Finally, to accommodate journals whose citation activity is better measured over a longer period of time, JCR offers a 5-year Impact Factor, which, in this case, averages citations in 2020 to journal articles published in 2016–2019 (four published years + 1 citation year = 5 years).
The total number of journals with a Journal Impact Factor included in the 2020 JCR is 20,932. There are an additional 5,742 titles without a Journal Impact Factor.
Change in Journal Impact Factor publication methodology
For the 2020 Journal Impact Factor, Clarivate has adjusted its publication timeline. Moving forward, articles that cite and are cited will be counted per the date of their published version of record, including publish ahead of print, or “Early Access.” This means that articles will be indexed and counted as published within the calendar year of their version of record date. In the case of Endocrine Society- published content, this will be the date of placement in “Advance Articles,” which is ahead of inclusion in an issue of the journal, also considered “Early Access.” The impact will be felt mostly among papers published ahead of print at the end of one calendar year, when they will be counted, and appearing copyedited in an issue in the following calendar year, when they will not.
The adjustment will be phased in as follows (from Clarivate’s website): The majority of articles have an Early Access publication date that is within the same calendar year as the final publication date. Clarivate’s treatment of these items in JCR will not change under the new policy. For the minority of Early Access content where the Early Access publication date is in a different year from the final publication date, Clarivate will use only the Early Access date. For example, citations from an article published with an Early Access date of 2020 and a final publication date of 2021 will contribute to the numerator of the 2020 Journal Impact Factor but not to the 2021 JIF; that same article will contribute to the denominator of the 2021 JIF and the 2022 JIF but not to the 2023 JIF.* In contrast, a non-Early Access item with a publication date of 2021 will contribute citations to the 2021 JIF and contribute to the denominator of the 2022 JIF and the 2023 JIF.
* This is because the Early Access date will follow the publication date in the denominator. If an Early Access article was published in 2020 (then published in an issue in 2021), it counts as part of the JIF denominator of articles published in 2020 and 2021 and cited in 2022. It will not contribute to the 2023 JIF because only articles published (Early Access) in 2021 and 2022 will be counted.
2020 JIF numerator
Starting with content indexed in 2020, Clarivate will include items in the JCR according to the earliest availability of the Version of Record. This means that the 2020 JIF numerator will include citations from:
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• Early Access items with an early access year of 2020 • Early Access items with a final publication year of 2020 and an Early Access year of 2019 or earlier* • Non-Early Access items with a final publication year of 2020 * This is a transitional step for the 2021 JCR release (2020 data) only.
2020 JIF denominator
There will be no Early Access contribution to the 2020 JIF denominator; the denominator will only include citable items with a final publication date of 2018 and 2019.
Endocrine Society journals and the category “Endocrinology & Metabolism”
Clarivate indexes each journal as part of one or more scientific categories. Endocrine Society journals belong to the Clarivate category “Endocrinology & Metabolism.” Each year, the Society reviews its journals’ metrics against other journals in this category.
In 2020, Clarivate categorized 179 journals in “Endocrinology & Metabolism.” Of those, 145 have a 2020 Journal Impact Factor.
Number of journals in JCR year of citations “Endocrinology & Metabolism” 2020 145 2019 143 2018 145 2017 143 2016 138
Clarivate has 254 categories. In 2020, the Endocrine Society ranked 5th among publishers in the category “Endocrinology & Metabolism,” with an average Impact Factor of 10.188. The publishers ranked higher are Cell Press, the American Diabetes Association, Nature Publishing Group, and Elsevier.
A full list of journals in this category can be found at the end of this report.
3 The Top 30 journals in the category “Endocrinology & Metabolism,” by 2020 Journal Impact Factor:
Rank Journal 2020 Journal 2019 Journal Numeric Percent 2019 Rank Impact Factor Impact Factor Change Change Rank Change 1 Nature Reviews Endocrinology 43.330 28.800 14.530 50.45% 1 0 2 Lancet Diabetes & Endocrinology 32.069 25.340 6.729 26.55% 2 0 3 Cell Metabolism 27.287 21.567 5.720 26.52% 3 0 4 Endocrine Reviews 19.871 14.661 5.210 35.54% 5 1 5 Diabetes Care 19.112 16.019 3.093 19.31% 4 −1 6 Nature Metabolism 13.511 n/a 13.511 100.00% n/a n/a 7 Journal of Pineal Research 13.007 14.528 -1.521 −10.47% 6 −1 8 Trends in Endocrinology and Metabolism 12.015 11.641 0.374 3.21% 7 −1 9 Diabetologia 10.122 7.518 2.604 34.64% 10 1 10 Cardiovascular Diabetology 9.951 7.332 2.619 35.72% 11 1 11 Diabetes 9.461 7.720 1.741 22.55% 9 −2 12 Obesity Reviews 9.213 7.310 1.903 26.03% 12 0 13 Metabolism-Clinical and Experimental 8.694 6.159 2.535 41.16% 17 4 14 Frontiers in Neuroendocrinology 8.606 9.059 -0.453 −5.00% 8 −6 15 Antioxidants & Redox Signaling 8.401 6.323 2.078 32.86% 14 −1 16 Molecular Metabolism 7.422 6.448 0.974 15.11% 13 −3 17 Free Radical Biology and Medicine 7.376 6.170 1.206 19.55% 16 −1 18 Current Obesity Reports 6.919 5.259 1.660 31.56% 23 5 19 Journal of Bone and Mineral Research 6.741 5.854 0.887 15.15% 19 0 20 European Journal of Endocrinology 6.664 5.308 1.356 25.55% 22 2 21 Diabetes Obesity & Metabolism 6.577 5.900 0.677 11.47% 18 −3 22 Thyroid 6.568 5.227 1.341 25.66% 24 2 23 Reviews in Endocrine & Metabolic Disorders 6.514 6.192 0.322 5.20% 15 −8 24 Journal of Cerebral Blood Flow and Metabolism 6.200 5.681 0.519 9.14% 20 −4 25 Diabetes Technology & Therapeutics 6.118 4.392 1.726 39.30% 30 5 26 Biofactors 6.113 4.734 1.379 29.13% 26 0 27 Diabetes & Metabolism 6.041 4.731 1.310 27.69% 28 1 28 Journal of Clinical Endocrinology & Metabolism 5.958 5.399 0.559 10.35% 21 −7 29 Aging Male 5.892 n/a 5.892 100.00% n/a n/a 30 Endocrine-Related Cancer 5.678 4.800 0.878 18.29% 25 −5
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Endocrine Society Journals’ Scores
Endocrine Reviews
Endocrine Reviews ranks No. 4 in the category “Endocrinology & Metabolism,” behind Nature Reviews Endocrinology, Lancet Diabetes & Endocrinology, and Cell Metabolism.
Endocrine Reviews’ 2020 Journal Impact Factor, 19.871, has increased by 5.210. Globally, it ranks 127th among 20,932 journals.
Endocrine Reviews metrics, with ranking in “Endocrinology & Metabolism” in parentheses:
Journal Impact Factor 5-year Journal Impact Factor Immediacy Index Cited Half-Life 2020 19.871 (4th) 24.715 (4th) 9.030 (4th) 12.5 (3rd) 2019 14.661 (5th) 19.795 (4th) 4.364 (5th) 12.9 (1st) 2018 15.167 (6th) 19.377 (4th) 2.632 (10th) 13.1 (1st) 2017 15.545 (4th) 18.639 (4th) 2.857 (7th) 12.9 (1st) 2016 15.745 (4th) 18.432 (3rd) 1.857 (9th) >10 2015 14.898 (4th) 18.154 (1st) 2.217 (6th) >10
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The Journal of Clinical Endocrinology & Metabolism (JCEM)
JCEM publishes the second highest volume of articles in the category “Endocrinology & Metabolism” and is the most cited journal. In 2020, JCEM was cited more than 90,000 times. In 2018, JCEM’s cited half-life surpassed 10 for the first time, meaning that the average citation lifespan of an article in JCEM is at least 10 years at its peak and at least 20 years at its longest.
JCEM metrics, with ranking in “Endocrinology & Metabolism” in parentheses:
Journal Impact Factor 5-year Journal Impact Factor Immediacy Index Cited Half-Life 2020 5.958 (28th) 6.792 (23rd) 1.880 (33rd) 10.8 (11th) 2019 5.399 (21st) 5.879 (19th) 1.430 (23rd) 10.7 (11th) 2018 5.605 (22nd) 5.333 (19th) 1.214 (34th) 10.2 (13th) 2017 5.789 (20th) 6.011 (17th) 1.020 (41st ) 9.9 (11th) 2016 5.455 (20th) 6.215 (16th) 1.233 (21st) 9.4 2015 5.531 (16th) 6.061 (14th) 1.270 (17th) 9.1
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5 Endocrinology
Endocrinology is the sixth most-cited journal in the category “Endocrinology & Metabolism,” earning more than 46,000 citations in 2020. Endocrinology’s cited half-life has exceeded 10 since 2015.
Endocrinology metrics, with ranking in “Endocrinology & Metabolism” in parentheses:
Journal Impact Factor 5-year Journal Impact Factor Immediacy Index Cited Half-Life 2020 4.736 (50th) 4.809 (53rd) 1.186 (64th) 13.2 (1st) 2019 3.934 (40th) 4.075 (41st) 1.005 (46th) 12.6 (2nd) 2018 3.800 (45th) 4.130 (39th) 1.235 (32nd) 12.0 (3rd) 2017 3.961 (38th) 4.224 (35th) 0.832 (54th) 11.5 (3rd) 2016 4.286 (29th) 4.438 (26th) 0.968 (35th) >10 2015 4.159 (30th) 4.323 (26th) 0.973 (27th) >10
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Journal of the Endocrine Society
The Society’s open-access journal, Journal of the Endocrine Society, was launched in January 2017. To date, it has not been assigned a Journal Impact Factor, though Society staff is able to monitor its citation activity using Clarivate’s Emerging Sources Citation Index. The journal is in the 2020 JCR, and in 2020, it received more than 1,600 citations.
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NOTE ABOUT CITED HALF-LIFE: In the 2020 Journal Citation Reports, Endocrine Society-published journals rank in the top three in Cited Half-Life in the category “Endocrinology & Metabolism”:
1. Endocrinology (13.2) 3. Endocrine Reviews (12.5)
Some of this can be attributed to the nature of these journals’ publications. Endocrinology is a basic science journal. Endocrine Reviews publishes reviews and translational science. JCEM (ranked 11th in 2020) publishes clinical papers.
6 Competing journals
Here is a table showing notable competing journals, their Journal Impact Factors, and the difference between 2020 and 2019.
2020 Journal 2020 Rank Change in JIF Change in rank in Journal Impact Factor in E&M from 2019 E&M from 2019
Nature Reviews Endocrinology 43.330 1 14.530 0
Lancet Diabetes & Endocrinology 32.069 2 6.729 0
Diabetes Care 19.112 5 3.093 −1
Diabetes 9.461 11 1.741 −2
Journal of Bone and Mineral Research 6.741 19 0.887 0
European Journal of Endocrinology 6.664 20 1.356 2
Thyroid 6.568 22 1.341 2
Endocrine-Related Cancer 5.678 30 0.878 −5
Journal of Endocrinology 4.286 61 0.245 −24
Molecular and Cellular Endocrinology 4.102 70 0.231 −28
Clinical Endocrinology 3.478 89 0.098 −27
Endocrine Connections 3.335 94 0.743 2
7 Endocrine Society Journals’ Impact Factors, 2004–2020 30
25
20
15
10
5
0 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Endocr Rev J Clin Endocr Metab Endocrinology
8 Competing Journals’ Impact Factors, 2011–2020 50
45
40
35
30
25 Endocr Rev
20
15 J Clin Endocr Metab
10
5
0 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Endocrinology Nat Rev Endocrinol Lancet Diabetes Endo Diabetes Care Endocr Rev Diabetes J Bone Miner Res Eur J Endocrinol Thyroid J Clin Endocr Metab Endocr-Relat Cancer Endocrinology J Endocrinol Mol Cell Endocrinol Clin Endocrinol Endocr Connect
9 Journals in the Clarivate JCR category “Endocrinology & Metabolism” 2020 (total: 145):
• Acta Diabetologica • Current Opinion in Clinical Nutrition and Metabolic • Acta Endocrinologica-Bucharest Care • Adipocyte • Current Opinion in Endocrinology Diabetes and • Aging Male Obesity • American Journal of Physiology-Endocrinology • Current Opinion in Lipidology and Metabolism • Current Osteoporosis Reports • Annales D'Endocrinologie • Diabetes • Annals of Nutrition and Metabolism • Diabetes & Metabolic Syndrome-Clinical Research • Annals of Pediatric Endocrinology & Metabolism & Reviews • Antioxidants & Redox Signaling • Diabetes & Metabolism • Archives of Endocrinology Metabolism • Diabetes & Metabolism Journal • Archives of Osteoporosis • Diabetes & Vascular Disease Research • Archives of Physiology and Biochemistry • Diabetes Care • Austrian Journal of Clinical Endocrinology and • Diabetes Educator Metabolism • Diabetes Mellitus • Best Practice & Research Clinical Endocrinology & • Diabetes Metabolic Syndrome and Obesity- Metabolism Targets and Therapy • Biofactors • Diabetes Obesity & Metabolism • Biological Trace Element Research • Diabetes Research and Clinical Practice • Biology of Sex Differences • Diabetes Stoffwechsel und Herz • BMC Endocrine Disorders • Diabetes Technology & Therapeutics • BMJ Open Diabetes Research & Care • Diabetes Therapy • Bone • Diabetes-Metabolism Research and Reviews • British Journal of Diabetes • Diabetic Foot & Ankle • Calcified Tissue International • Diabetic Medicine • Canadian Journal of Diabetes • Diabetologe • Cardiovascular Diabetology • Diabetologia • Case Reports in Endocrinology • Diabetologie und Stoffwechsel • Cell Metabolism • Diabetology & Metabolic Syndrome • Clinical Cases in Mineral and Bone Metabolism • Diabetology International • Clinical Diabetology • Domestic Animal Endocrinology • Clinical Endocrinology • Endocrine • Clinical Medicine Insights-Endocrinology and • Endocrine Connections Diabetes • Endocrine Journal • Clinical Obesity • Endocrine Metabolic & Immune Disorders-Drug • Clinical Pediatric Endocrinology Targets • Clinical Reviews in Bone and Mineral Metabolism • Endocrine Pathology • Comparative Biochemistry and Physiology C- • Endocrine Practice Toxicology & Pharmacology • Endocrine Research • Correspondances en Metabolismes Hormones • Endocrine Reviews Diabetes et Nutrition • Endocrine-Related Cancer • Current Diabetes Reports • Endocrinologia Diabetes y Nutricion • Current Diabetes Reviews • Endocrinology • Current Obesity Reports • Endocrinology and Metabolism
10 • Endocrinology and Metabolism Clinics of North • Journal of Diabetes Investigation America • Journal of Diabetes Research • Endocrinology Diabetes and Metabolism Case • Journal of Endocrinological Investigation Reports • Journal of Endocrinology • Endokrynologia Polska • Journal of Endocrinology and Metabolism • European Journal of Endocrinology • Journal of Endocrinology Metabolism and • European Thyroid Journal Diabetes of South Africa • Experimental and Clinical Endocrinology & • Journal of Inherited Metabolic Disease Diabetes • Journal of Mammary Gland Biology and Neoplasia • Expert Review of Endocrinology & Metabolism • Journal of Molecular Endocrinology • Free Radical Biology and Medicine • Journal of Neuroendocrinology • Frontiers in Endocrinology • Journal of Obesity • Frontiers in Neuroendocrinology • Journal of Obesity & Metabolic Syndrome • Frontiers of Hormone Research • Journal of Pediatric Endocrinology & Metabolism • General and Comparative Endocrinology • Journal of Pineal Research • Growth Factors • Journal of Steroid Biochemistry and Molecular • Growth Hormone & IGF Research Biology • Gynakologische Endokrinologie • Journal of the ASEAN Federation of Endocrine • Gynecological Endocrinology Societies • Hormone and Metabolic Research • Journal of the Endocrine Society • Hormone Research in Paediatrics • Journal of Thyroid Research • Hormones & Cancer • Journal of Trace Elements in Medicine and • Hormones and Behavior Biology • Hormones-International Journal of Endocrinology • Lancet Diabetes & Endocrinology and Metabolism • Magnesium Research • International Journal of Diabetes in Developing • Metabolic Brain Disease Countries • Metabolism-Clinical and Experimental • International Journal of Endocrinology • Metabolomics • International Journal of Endocrinology and • Minerva Endocrinologica Metabolism • Molecular and Cellular Endocrinology • International Journal of Obesity • Molecular Genetics and Metabolism • Islets • Molecular Metabolism • Journal of Biological Regulators and Homeostatic • Nature Metabolism Agents • Nature Reviews Endocrinology • Journal of Bone and Mineral Metabolism • Neuroendocrinology • Journal of Bone and Mineral Research • Neuroendocrinology Letters • Journal of Cerebral Blood Flow and Metabolism • Neuroimmunomodulation • Journal of Clinical and Translational Endocrinology • Neuropeptides • Journal of Clinical Densitometry • Nutrition & Diabetes • Journal of Clinical Endocrinology & Metabolism • Nutrition Clinique et Metabolisme • Journal of Clinical Research in Pediatric • Nutrition Metabolism and Cardiovascular Diseases Endocrinology • Obesity • Journal of Diabetes • Obesity Facts • Journal of Diabetes and Its Complications • Obesity Research & Clinical Practice • Journal of Diabetes and Metabolic Disorders • Obesity Reviews
11 • Obesity Science & Practice • Osteoporosis International • Pediatric Diabetes • Peptides • Pituitary • Practical Diabetes • Primary Care Diabetes • Prostaglandins Leukotrienes and Essential Fatty Acids • Prostate • Psychoneuroendocrinology • Reproductive Biology and Endocrinology • Reviews in Endocrine & Metabolic Disorders • Revista de Osteoporosis y Metabolismo Mineral • Revista Portuguesa de Endocrinologia Diabetes e Metabolismo • Steroids • Stress-The International Journal on the Biology of Stress • Therapeutic Advances in Endocrinology and Metabolism • Thyroid • Thyroid Research • Trace Elements and Electrolytes • Trends in Endocriniology and Metabolism • Turkish Journal of Endocrinology and Metabolism • Vitamins and Hormones • World Journal of Diabetes
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