  When performing an aggregate data meta-analysis of a continuous outcome,
researchers often come across primary studies that report the sample median of
the outcome. However, standard meta-analytic methods typically cannot be
directly applied in this setting. In recent years, there has been substantial
development in statistical methods to incorporate primary studies reporting
sample medians in meta-analysis, yet there are currently no comprehensive
software tools implementing these methods. In this paper, we present the
metamedian R package, a freely available and open-source software tool for
meta-analyzing primary studies that report sample medians. We summarize the
main features of the software and illustrate its application through real data
examples involving risk factors for a severe course of COVID-19.
