Table 2. Coded medical encounters by population and cause category.

Cause	Encounters by Active Duty Members (July 1998–June 2011)			Encounters by Dependent Beneficiaries (July 2001–June 2011)
	N	Seasonal Year* Mean No. (%)	Encounters per 10,000 Persons	N	Seasonal Year* Mean No. (%)	Encounters per 10,000 Persons
Cause unspecified	1,732,903	133,300 (98.5)	936.4	1,764,784	176478.4 (98.2)	335.1
Bacterial	21,955	1,689 (1.2)	11.9	20,337	2033.7 (1.1)	3.9
Protozoal	2,502	192 (0.1)	1.4	3,078	307.8 (0.2)	0.6
Rotavirus	303	23 (<0.1)	0.2	8,060	806 (0.4)	1.5
Adenovirus	464	36 (<0.1)	0.3	539	53.9 (<0.1)	0.1
Norovirus	435	33 (<0.1)	0.2	342	34.2 (<0.1)	0.1
All-cause gastroenteritis	1,758,562	135,274	950.2	1,797,140	179,714	341.2

*Time period from July through June of the following year.