Data linkage errors in hospital administrative data when applying a pseudonymisation algorithm to paediatric intensive care records.

Hagger-Johnson G, Harron K, Fleming T, Gilbert R, Goldstein H, Landy R, Parslow RC.

BMJ Open. 2015 Aug 21;5(8):e008118.

Our aim was to estimate the rate of data linkage error in Hospital Episode Statistics (HES) by testing the HESID pseudoanonymisation algorithm against a reference standard, in a national registry of paediatric intensive care records.