The Wales Asthma Observatory (WAO) is a patient registry and a platform for asthma research and surveillance. It was developed to explore what is happening to patients with asthma in Wales and to examine this longitudinally in order to support improvements in the quality of treatment and care provided to patients and to also inform health service planning and clinical research.

The registry includes asthma patients from over 80% of GP practices linked with SAIL in Wales, totalling around 190,000 patients with current treated asthma. The registry consists of a database detailing the care received by asthma patients, the incidence, outcomes, healthcare events and treatments related to asthma.

WAO contains routinely collected uniform data on patients’ diagnoses, care processes, and outcomes, enabling systematic comparison and analysis across multiple patients and sites. It can be used to understand the epidemiology of asthma in Wales, support quality improvement initiatives, and inform health service planning and clinical research. 

The Wales Asthma Observatory is a part of the UK Asthma Observatory, a hub for data relating to asthma in the UK, led by Asthma UK Centre for Applied Research.

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