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The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
The impact factor relates to a specific time period; it is possible to calculate it for any desired period. For example, the JCR also includes a five-year impact factor, which is calculated by dividing the number of citations to the journal in a given year by the number of articles published in that journal in the previous five years. [14] [15]
Impact factor. 2.838 (2021) Standard abbreviations ... According to the Journal Citation Reports, the journal has a 2020 impact factor of 2.679. [5] References
Impact factor. 4.501 (2021) ... According to the Journal Citation Reports, the journal has a 2020 impact factor of 4.146. [5] References External links ...
While these journals still did not receive an impact factor until the next year, they did contribute citations to the calculation of other journals' impact factors. [4] [5] In July 2022, Clarivate announced that journals in the ESCI obtain an impact factor effective from JCR Year 2022 first released in June 2023. [6]
Impact factor. 6.575 (2021) Standard abbreviations ... According to the Journal Citation Reports, the journal has a 2020 impact factor of 6.639. [5] References
According to the Journal Citation Reports, the journal has a 2020 impact factor of 22.682, ranking it 4th among 92 journals in the category "Gasteroenterology & Hepatology". [ 1 ] References
According to the Journal Citation Reports, the journal had a 2020 impact factor of 5.095, ranking it 23rd out of 89 journals in the category "Nutrition & Dietetics" and 38th out of 145 journals in the category "Endocrinology & Metabolism". [2]