. 2014 Oct 27;43(Database issue):D1071–D1078. doi: 10.1093/nar/gku1011

Table 3. The overlap between disease vocabularies.

	DO	ORDO	CTD	NDF-RT	KEGG	HPO-D	NCI
DO	8,757^a	1,492	3,432	3,200	1,102	1,278	2,092
ORDO	1,952	4,799^a	3,503	1,465	2,383	4,170	993
CTD	6,413	6,418	11,898^a	6,701	6,607	2,883	2,345
NDF-RT	2,878	1,091	4,660	4,700^a	775	876	1,686
KEGG	854	1,105	1,303	718	1,359^a	1,102	522
HPO-D	2,291	5,426	3,818	1,169	3,102	7,520^a	818
NCI	3,692	888	1,004	1,865	625	694	4,252^a

The number of identical terms between any two disease vocabularies indicates the degree of overlap between them. The off-diagonal numbers in the overlap matrix can be interpreted as the number of terms from the row disease resource covered by the column disease resource. For example, DO has common cross-references with 1492 of the 4799 ORDO terms, while ORDO has common cross-references with 1952 of the 8757 DO terms. The diagonal numbers in the overlap matrix indicate the total number of terms in each disease resource.

^aThe total number of disease terms in each disease vocabulary.