Emergency Department Data Set (EDDS)

Data Providing Organisation:
NHS Wales’ Informatics Service (NWIS)

Data Providing Type:
Administrative (mandatory) data return



Administrative and clinical information for all NHS Wales Accident and Emergency department attendances. Includes the All Wales Injury Surveillance Systems (AWISS) dataset.

Data Collection Method

The data are collected and coded at each hospital.

Data Highlights

Data recording practices may vary, especially in some of the minor A&E and Minor Injury Units which could account for some local differences.

Access Requirements

As a core SAIL dataset available in accordance with our standard Information Governance procedure.


Approx. 750,000 attendances per year

Data Level

Individual person

Data Years

2009 – Present

SAIL Schema