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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