A Record Linkage Protocol for a Diabetes Registry at Ethnically Diverse Community Health Centers

Table 6

Sensitivity and Positive Predictive Value of Matching Using an Optimal Match Key (F2/DOB) by Health Center, Patient Demographics, and Payer

Item	True Matches, N	Sensitivity, %	PPV, %
Health Center*
A	906	94.9†	98.9
B	582	94.9	99.8
C	491	92.3	99.8
D	180	90.0	100.0
E	97	90.7	100.0
F	80	79.2	98.8
G	37	88.1	100.0
Ethnicity
Asian	750	93.9	98.8
African American	218	94.0	100.0
Latino	752	93.1	99.9
Native American	53	91.4	98.2
White (non-Hispanic)	120	87.0	100.0
Missing	480	93.2	99.6
Age
< 25	29	96.7†	100.0
25–44	323	95.9	99.4
45–64	1,014	91.1	99.7
65+	1,007	94.1	99.1
Gender
Male	868	94.2†	99.7
Female	1,492	91.6	99.4
Payer
Uninsured	734	93.7†	99.6
Medicaid	482	91.5	99.6
Medicare	781	94.3	99.1
Commercial	102	94.4	100.0
Missing	219	88.3	99.6

↵* The letter identifying a health center in Table 6 may not correspond to that in Table 1.
↵† p < 0.05.

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