Table 1:

Seven SNOMED CT hierarchies and their reduction factors.

Hierarchy	# Concepts (C)	#Areas (A)	# P-Areas (P)	C/A	C/P	Reduction Factor
Body Structure	31155	2	23	15577.5	1354.57	0.0738%
Clinical Finding	98414	347	10393	283.62	9.47	10.55%
Event	3661	7	31	523	118.10	0.846%
Pharm/ Biologic Product	17129	4	8540	4282	2.01	49.71%
Procedure	52665	729	10731	72.24	4.91	20.32%
Situation	3237	10	837	323.7	3.87	25.86%
Specimen	1330	23	407	57.83	3.27	30.60%