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Table 1 General metrics on the three extracted modules of SNOMED-CT

From: Analysing Syntactic Regularities and Irregularities in SNOMED-CT

   Present and absent Chronic findings Acute findings
   clinical findings   
Target entities   Classes whose labels Classes whose labels Classes whose labels
   have the keywords have the keywords have the keywords
   “present” or “absent” “chronic” “acute”
Axioms   5 065 20 688 19 812
Classes   1 687 6 842 6 599
Object properties   16 25 25
Mean class hierarchy depth   9.76 11.2 10.09