Table 1.

Attributes by category from three drug classifications.

		Medicare	Comm.
	NDF	Part D	KB
Chemical Structure	130	29	93
Mechanism of Action	89	35	51
Physiological Effect	192	37	109
Therapeutic Intent	318	88	123
Formulation	97	28	40
Non-patient Activity	47	27	27
Other	103	5	14
Total	976	249	461
Number of Classes	480	170	298
Average Attributes per Class	2.03	1.46	1.55

NDF = National Drug File, Comm. KB = Commercial Knowledge Base (existing NDF-RT categories in italics)