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
-
171 Million
records
-
14.7 Million
people
-
9
average links per person
NSW NSW data that contributes to the CHeReL Master Linkage Key
Jul 2001 – Sep 2018
44,943,771 records
(updated quarterly)
Private hospitals until Dec 2017
Jan 2005 – Sep 2018
32,379,681 records
Jan 1994 – Dec 2017
2,206,042 records
Updated Jan 2018
266,887 records
Jan 1972 - Dec 2015
1,222,609 records
Jan 1985 - Sep 2018
1,559,686 records
Jan 1994 - Dec 2017
2,236,775 records
Jan 1993 - Dec 2017
1,126,477 records
Jan 2000 - Dec 2015
11,876 records
Jan 1985 - Dec 2016
1,418,797 records
1963-2016
242,975 records
Jan 2001 - June 2018
41,391,832 records
Jul 1996 - Jun 2017
15,075,884 records
2009-2016
279,468 records
Jan 2005 - Jun 2018
9,474,892 records
Jan 1998 - Dec 2016
6,122,103 records
ACT ACT data that contributes to the CHeReL Master Linkage Key
Jul 2004 - Jun 2017
1,217,458 records
Jul 2005 - Jun 2017
1,387,223 records
Jan 1994 - Dec 2015
31,478 records
Jan 1997 - Dec 2016
73,967 records
Jan 2000 - Dec 2015
49,501 records
Jan 1997- Jun 2017
39,017 records
Jan 1997- Dec 2017
116,176 records
Jan 1994 - Dec 2015
821,528 records
Jul 2014 - Jul 2016
15,124 records
Upcoming Upcoming data that contributes to the CHeReL Master Linkage Key
