2020 Journal Citation Reports for Endocrine Society Journals
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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 -------------------------------- 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). -------------------------------- 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. -------------------------------- 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: 2 • 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 4 Endocrine Society Journals’ Scores Endocrine Reviews Endocrine Reviews ranks No.