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Table 4 Details of the reference alignments. Shown are the number of mappings in the BioPortal and UMLS Metathesaurus reference alignments. Also shown are the overlap and harmonic mean of the overlap between the alignments. The harmonic mean was calculated by weighting the reference alignment means by the number of mappings in each reference alignment

From: Performance assessment of ontology matching systems for FAIR data

Ontology pair

Ontology type

Mappings UMLS

Mappings BioPortal

Overlap

Harmonic mean overlap

ORDO-SNOMED CT

Module

35

7

3

14%

NCIt-ORDO

Module

27

18

12

53%

NCIt-SNOMED CT

Module

127

90

56

52%

ORDO-SNOMED CT

Whole ontology

3,861

1,750

776

28%

NCIt-ORDO

Whole ontology

1,484

1,450

656

45%

NCIt-SNOMED CT

Whole ontology

19,309

16,290

10,195

57%