Table 3. Number of Incident Diabetes Cases, Years of Membership Following Diagnosis Date, and Source of First Indication of Diabetes, by Health System, 2002–2009.

Site	Incident Diabetes Casesa	Mean Years of Enrollment With Diabetesb	Source of First Indication of Diabetesc
			Inpatient Diagnosis, %	Outpatient Diagnoses, %	Pharmacy Dispense, %	Outpatient Laboratory Results, %
1	18,287	3.3	11.0	17.5	16.6	54.9
2	151,177	3.6	9.6	20.0	20.1	50.2
3	7,248	3.3	14.4	36.2	12.4	37.0
4	153,473	3.4	9.8	18.9	23.2	48.1
5	10,149	3.2	15.0	26.7	26.8	31.5
6	12,062	3.5	6.1	41.4	17.0	35.5
7	8,253	2.7	16.6	40.5	11.9	31.0
8	27,096	3.1	4.3	51.2	26.7	17.8
9	11,832	3.5	8.5	13.7	10.5	67.3
10	15,059	3.3	14.2	19.0	16.3	50.5
11	13,713	3.4	12.7	16.9	16.0	54.5
Total	428,349	3.3	9.9	22.6	20.7	46.8

^a Number of diabetes cases with at least 2 years of health system eligibility before first indication of diabetes.

^b Calculated as number of years following first indication of diabetes until end of health system enrollment or December 31, 2009, whichever came first.

^c Based on study criteria in Table 1, the source of the earliest indication of diabetes.