“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.
Chemistry130Pharmacology, Toxicology and Pharmaceutics36Medicine25Materials Science22Neuroscience22Agricultural and Biological Sciences21Medicine: Other systems of medicine1Medicine: Pharmacy and materia medica1