Skip to main content

EDDS Data Consistency


The Emergency Department Data Set (EDDS) Data Consistency Standards have been in place since August 2013. These were mandated in order to ensure effective monitoring of performance in terms of data consistency, one of the key components of data quality as described in About Data Quality. These standards comprise a list of indicators and associated targets by which compliance is monitored on a monthly basis using the EDDS Data Consistency reports.

This document describes the background, purpose and logic behind each of these standards in detail.  The Welsh Government issued details on the measurement and reporting of unscheduled care 4 & 8 hour wait targets in December 2011, and again in March 2012.  A letter was issued by the Head of Information, DHCW to notify the service of actions required to implement the necessary changes.

The validation rules* applied to the data items within the EDDS data set are explained in detail on the NHS Wales Data Switching Service* webpages.

Any changes to these standards are described on the Change History page.


* Currently accessible to NHS Wales Users Only