. Author manuscript; available in PMC: 2013 Feb 1.

Published in final edited form as: J Biomed Inform. 2011 Aug 25;45(1):15–29. doi: 10.1016/j.jbi.2011.08.013

Table 1.

Statistics of overlapping concepts at Levels 1 and 2.

Area	C	V	V/C (%)	D	Avg = V/D
Substance	81	35	43	9	3.9
Topography	333	116	35	52	2.2
Procedure	20	3	15	3	1.0
Identity	20	1	5	1	1.0
Topography, procedure	380	6	2	6	1.0
Topography, morphology	18	1	6	1	1.0
Total	852	162	19	72	2.3

C = # concepts; V = # overlapping concepts; D = # overlapping roots.