Table 2.

Summary of ontologies that reuse content and source ontologies reused.

Reuse Metrics for BioPortal Ontologies (%, n = 355)
# Including reused content	197 (55.5%)
# Including reused classes	149 (42.0%)
# Including properties	160 (45.1%)
# Including the BFO	77 (21.7%)
# Using reused classes in modeling of new classes	108 (30.4%)
# Using reused properties in class restrictions	116 (32.7%)
Source Ontologies (%, n = 147)
# With reused classes	144 (98.0%)
# With reused properties	58 (39.5%)
# With classes supporting modeling	91 (63.2%)
# With classes directly supporting modeling	91 (63.2%)
# With classes indirectly supporting modeling	54 (37.5%)
# With properties used in restrictions on new classes	23 (15.6%)
# With properties used as a super property	15 (10.4%)