Work funded by the Belgian Federal Public Planning Service Science Policy ( grants Nr I2/ AE/ 207 and I2/ 2F/ 207) and by the National Institute for Health and Disability Insurance. Quality assessment of automatically extracted data from GPs' EPR

There are many secondary benefits to collecting routine primary care data, but we first need to understand some of the properties of this data. In this paper we describe the method used to assess the PPV and sensitivity of data extracted from Belgian GPs' EPR (diagnoses, drug prescriptions, referrals, and certain parameters), using data collected through an electronic questionnaire as a gold standard. We describe the results of the ResoPrim phase 2 project, which involved 4 software systems and 43 practices (10,307 patients). This method of assessment could also be applied to other research networks.