Data Resource Profile: Registry of electronic health records of general practices in the north of The Netherlands (AHON)

Key Features• The AHON registry contains longitudinal data from the electronic health records (EHRs) of 73 general practices in the north of The Netherlands.Established in 2017 by the Department of Primary and Long-term Care at the University Medical Center Groningen, using data from 2013 onwards, data are collected by quarterly imports from EHRs.• The registry contains information about 460 795 patients, with a median (interquartile range) follow-up of 5.5 (3.0-7.6)years, at both the practice level (e.g.location and practice size) and the patient level (e.g.demographic, episode based, and other medical information).It contained 306 242 active patients on 1 July 2022.• The infrastructure is mapped onto a common data model to enable collaboration with other general practice registries.• To date, the AHON registry has been used in many studies.It is well suited for joining with other data sources both vertically (adding new variables) and horizontally (adding other external population registry files).