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Comparison of the size of lexicons.
| Lexicon | Concepts (CUIa) | Variants | Average number of variants per CUI |
| Corpus-driven lexicon | 6177 | 33,351 | 5.40 |
| SNOMED-CTb | 412,027 | 1,349,838 | 3.28 |
| UMLSc | 4,440,279 | 9,569,507 | 2.16 |
aCUI: concept unique identifier.
bSNOMED-CT: Systematized Nomenclature of Medicine Clinical Terms.
cUMLS: Unified Medical Language System.
