Fig. 3: Contribution of COVID-19 papers to the JIF.

a Comparison of JIF 2021 and JIF 2020 before and after removing covid-19 publications. b Distribution of contribution rate of covid-19 papers for JIF 2021. c Comparison of JIF 2022 and JIF 2021. d Distribution of contribution rate of covid-19 papers for JIF 2022.