Master Linkage Key (MLK)
The Master Linkage Key is a system of continuously updated links within and between core health-related datasets in NSW and the ACT. Both person and family-based extractions are available, as are tailored linkage services using additional datasets.
Quality assurance checks are regularly carried out on the Master Linkage Key. For more information on our quality checks and procedures see the Quality Assurance page.
CHeReL Master Linkage Key
-
180 Million
records
-
15 Million
people
-
13
average links per person
NSW NSW data that contributes to the CHeReL Master Linkage Key
Jul 2001 – Dec 2019
49,437,040 records
(updated quarterly)
Private hospitals until June 2019
Jan 2005 – Dec 2019
36,224,000 records
Jan 1994 – Dec 2018
2,301,594 records
Updated Jan 2018
266,887 records
Jan 1972 - Dec 2016
1,277,181 records
Jan 1985 - Dec 2019
1,628,543 records
Jan 1994 - Dec 2018
2,345,188 records
Jan 1993 - Dec 2018
1,295,340 records
Jan 2000 - Dec 2016
12,626 records
Jan 1985 - Dec 2017
1,524,226 records
Jan 2001 - Dec 2019
46,710,576 records
1963-2016
242,975 records
Jul 1996 - Jun 2017
15,075,884 records
2009-2016
279,468 records
Jan 2005 - Sep 2019
10,526,206 records
Jan 1998 - Dec 2016
6,122,103 records
1985-2019
685,715 records
ACT ACT data that contributes to the CHeReL Master Linkage Key
Jul 2004 - Jun 2018
1,336,402 records
Jan 1994 - Dec 2017
36,399 records
Jul 2005 - Jun 2018
1,535,463 records
Jan 1997 - Dec 2017
79,286 records
Jan 2000 - June 2019
72,161 records
Jan 1997- Dec 2018
39,259 records
Jan 1997- Jun 2019
119,267 records
Jul 2014 - Jul 2016
15,124 records
2011-2018
277,236 records
Upcoming Upcoming data that contributes to the CHeReL Master Linkage Key
