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. Author manuscript; available in PMC: 2008 Jun 16.
Published in final edited form as: Stud Health Technol Inform. 2007;129(Pt 1):605–609.

Table 4.

Precision ladder according to precision of each sub-category of mapping

Rank Sub-category Precision
1 M-PM (MetaMap perfect match) 85.8%
2 I-S (IntraMap synonymy) 78.3%
3 C-O (Combined overlapping) 50.8%
4 I-EM (IntraMap explicit mapping) 50.1%
5 M-TM (MetaMap top score) 22.6%
6 C-IO (Combined IntraMap only) 13.7%
7 I-AE (IntraMap ancestor expansion) 9.2%
8 C-MO (Combined MetaMap only) 3.9%