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Table 2 Linkage stages in the PIAC project

From: Empirical aspects of record linkage across multiple data sets using statistical linkage keys: the experience of the PIAC cohort study

Stage Dataset 1 Dataset 2 Minimum match rate (from one-step deterministic linkage on SLK-581) Final match rate (from stepwise deterministic linkage)
    % dataset 1 % dataset 2 % dataset 1 % dataset 2
1 Residential care 2002-06(a) Community care packages 2002-06(a) 9.4 44.0 10.2 47.7
2 Deaths July 03-Dec 06(a) RCCP 2002-06(a) (from stage 1) 32.6 36.9 36.2 41.0
3 PIAC cohort (ACAP 2003-04) (b) RCCP 2002-06 (a) 64.4 16.3 72.6 18.4
4 Deaths July 03-Dec 06 not linked to RCCP (a) ACAP 2003-04 not linked to RCCP(b) 3.0 31.4 3.3 34.7
5 PIAC cohort(b) Aged care assessments 2004-05(b) 29.4 21.8 30.9 22.9
6a PIAC cohort(b) Home and Community Care 2002-03(b) 41.6 7.1 46.3 7.9
6b PIAC cohort(b) Home and Community Care 2003-04(b) 53.4 8.3 58.5 9.1
6c PIAC cohort(b) Home and Community Care 2004-05(b) 35.9 5.3 39.5 6.0
6d PIAC cohort(b) Home and Community Care 2005-06(b) 22.8 3.4 26.2 3.9
7 PIAC cohort(b) Veterans' Home Care January 2001 - March 2008(a) 11.4 7.3 12.2 7.8
  1. (a) Clients identified through administrative processes, and de-duplication.
  2. (b) Clients identified by SLK-581 within broad region (1st digit of postcode)
  3. Note: For the datasets with administratively-derived person identifiers, data for all years in the study were linked at the same time. For data sets with clients identified by SLK-581 data were linked for each year separately to allow for variation over time in reported SLK-581.