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Table 1 Linkage using Medicare number and suffix (V1)

From: Validation of de-identified record linkage to ascertain hospital admissions in a cohort study

Iteration

Linkage Variables used in V1

Records

Linked

Records

remaining

1

Medicare81 + Medsuf12

1,667

333

2

Medicare8+first and second letters of Medsuf1+Sex

7

326

3

Medicare8+ second and third letters of Medsuf1+Sex

2

324

4

Medicare8+first and third letters of Medsuf1+Sex

0

324

5

Medicare8+Yearbirth+Sex

26

298

6

Medsuf1+Yearbirth+Monthbirth+Daybirth+Sex+Country of Birth+Postcode1

32

266

7

Medsuf1+Yearbirth+Monthbirth+Daybirth+Sex+Country of Birth+Postcode2

4

262

8

Medsuf1+Yearbirth+Monthbirth+Daybirth+Sex+Country of Birth+Postcode3

2

260

9

Medsuf1+Yearbirth+Monthbirth+Daybirth+Sex+Country of Birth+Postcode4

1

259

10

Yearbirth+Monthbirth+Daybirth+Sex+Country of Birth+Postcode1

124

135

 

Total Matched

1865

135

  1. 1 First 8 digits of the Medicare number; 2 First 3 letters of the first name