Graph showing the frequency, as a percentage of records, with which concepts that appear in a database at a rate more than three deviations from the mean frequency computed across all databases. Only two concepts (the RxNorm code for amlodipine 10 mg/benazepril 20 mg oral capsule and the Systematized Nomenclature of Medicine code for large liver) appeared in more than 0.10% of the records in a database. CCAE, Commercial Claims and Encounters; GPI, generic product identifier; ICD9, International Classification of Diseases, Ninth Revision; MDCD, MarketScan Medicaid Multi-State Database; MDCR, Medicare Supplemental and Coordination of Benefits Database; MSLR, MarketScan Lab Database; NDC, National Drug Code.