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Table 1 Metrics of the track ontologies. Source: NCBI BioPortal on 2nd June 2016

From: Matching disease and phenotype ontologies in the ontology alignment evaluation initiative

Ontology Number of axioms Number of classes Maximum depth Avg. number of children
HP 137,289 11,786 15 3
MP 129,036 11,721 15 3
DOID 124,362 9248 12 3
ORDO 188,991 12,936 11 16
  1. Note that the metric “average number of children” excludes the leaf nodes