The Danish National Patient Registry: a review of content, data quality, and research potential

The Danish National Patient Registry (DNPR) is one of the world's oldest nationwide hospital registries and is used extensively for research. Many studies have validated algorithms for identifying health events in the DNPR, but the reports are fragmented and no overview exists.To review the content, data quality, and research potential of the DNPR.We examined the setting, history, aims, content, and classification systems of the DNPR. We...