Table 2.

Top 20 mostly covered UMLS source vocabularies.

	Tumblr			Yahoo! Answers
Rank	Blogs (n=2415)			Questions (n=6452)					Answers (n=10,378)
	Source vocabulary	# of concepts	%	Source vocabulary		# of concepts		%	Source vocabulary		# of concepts	%
1	SNOMED CT	2315	95.9	SNOMED CT		5476		84.9	SNOMED CT		9032	87.0
2	CHV	1931	80.0	CHV		4928		76.4	CHV		7625	73.5
3	MTH	1774	73.5	MTH		3899		60.4	MTH		5780	55.7
4	NCIt	1156	47.9	MeSH		2957		45.8	MeSH		4796	46.2
5	MeSH	1130	46.8	NCIt		2917		45.2	NCIt		4485	43.2
6	CSP	812	33.6	CSP		1840		28.5	NDFRT		2999	28.9
7	AOD	775	32.1	NDFRT		1775		27.5	CSP		2839	27.4
8	LCH_NW	771	31.9	LCH_NW		1627		25.2	LCH_NW		2436	23.5
9	LOINC	697	28.9	AOD		1585		24.6	AOD		2335	22.5
10	NDFRT	659	27.3	LOINC		1510		23.4	RXNORM		2099	20.2
11	LCH	587	24.3	RXNORM		1421		22.0	LOINC		2081	20.1
12	NCI_NCI-GLOSS	475	19.7	LCH		1187		18.4	LCH		1730	16.7
13	MEDLINEPLUS	402	16.6	NCI_NCI-GLOSS		952		14.8	NCI_FDA		1387	13.4
14	CST	365	15.1	NCI_FDA		868		13.5	DXP		1322	12.7
15	COSTAR	362	15.0	COSTAR		835		12.9	NCI_NCI-GLOSS		1321	12.7
16	NCI_FDA	345	14.3	DXP		830		12.9	COSTAR		1257	12.1
17	OMIM	342	14.2	CST		794		12.3	OMIM		1234	11.9
18	RXNORM	338	14.0	OMIM		790		12.2	CST		1206	11.6
19	DXP	326	13.5	MEDLINEPLUS		721		11.2	VANDF		1117	10.8
20	ICD9CM	241	10.0	VANDF		644		10.0	MTHSPL		1033	10.0