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Storing and Querying Longitudinal Data Sets in an Open Source EHR
John Chelsom, Naveed Dogar
65 - 69
10.3233/978-1-61499-742-9-65
Studies in Health Technology and Informatics
Volume 234: Building Capacity for Health Informatics in the Future
Abstract

The cityEHR is an example of an open source EHR system which stores clinical data as collections of XML documents. The records gathered in routine clinical care are a rich source of longitudinal data for use in clinical studies. We describe how the standard language XQuery can be used to identify cohorts of patients, matching specified criteria. We discuss methods for ensuring good data quality and the issues in implementing XML queries on longitudinal data sets.

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