“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.
Pharmacology, Toxicology and Pharmaceutics38Agricultural and Biological Sciences23Chemistry20Materials Science11Immunology and Microbiology10Medicine10Medicine: Pharmacy and materia medica1Science: Chemistry1