11 years of quasi-exhaustive SNDS for a research project on the CASD authorised by the CNIL

For the first time on this scale, the French National Commission for Information Technology and Civil Liberties (CNIL) has just authorised a search using data from the National Health Data System (SNDS), which is virtually exhaustive over 11 years from 2008 to 2018. Data from the health professionals’ repository are also associated.

The overall volume of data is of the order of a hundred terabytes which will be processed on a CASD computing cluster. Certified ISO 27001, ISO 27701 (RGPD), the CASD is a health data host. Its architecture, approved by the health data security reference system, does not require additional approval of the local infrastructures of the various institutions thanks to the use of SD-Boxes. It has thus simplified the procedures to be carried out by the researchers with the CNIL regarding security aspects.

This project, whose high scientific quality has been underlined by the Comité éthique et scientifique pour les recherches, les études et les évaluations dans le domaine de la santé (CESREES), will be carried out by a multi-centre team of researchers in health economics coordinated by CREST (P. Choné, F. Kramarz, M. Monziols), which will study the mechanisms of allocation of patients to the actors in the health care system, via graph analysis methods (networks in the mathematical sense). In particular, the research will make it possible to study the formation of links between patients and health professionals, the structure and evolution of these links.