“2-yr mean citedness” is the OpenAlex field summary_stats.2yr_mean_citedness (CC0): mean citations per paper over a two-year window. It is a raw bibliometric field, not a journal rating, and is not used for default ranking.
Medicine694Biochemistry, Genetics and Molecular Biology635Pharmacology, Toxicology and Pharmaceutics516Environmental Science499Immunology and Microbiology468Medicine: Public aspects of medicine: Toxicology. Poisons1