Medico-economic Evaluation of a Telemedicine System for the Management of Chronic Renal Failure

The main objective of this study is to demonstrate the efficiency ( cost-effectiveness ) of a telemedicine system : eNephro Application , compared with traditional care in the management of chronic renal failure in different populations : * population 1 : Patients with CKD stage 3B- 4 , the combined endpoint achievement of target blood pressure and proteinuria . * population 2 : Patients with ESRD treated by ambulatory dialysis , the cumulative duration of hospitalization in short-stay * population 3 : Patients with ESRD treated with Renal Transplantation , the cumulative duration of unplanned short stay Two statistical analysis will be done : * a main analysis for the one year initial follow-up for each patient * a secondary analysis for the one year initial follow-up estended by one year (proposed to each patient at the end of the initial follow-up), that is a 2 years period. The intervention tested in this study is a telemedicine system which is a collaborative and expert system, consisting of: * A dynamic shared medical record for the collection of administrative , medical, biological and clinical data for each patient. All health professionals can access the folder and fill in the support. It is the same for patients treated at home. * A secure messaging for communication between health professionals and between patients and health professionals * Expert systems analyzing data from each patient * A management tool of therapeutic education Each patient and whatever the group will perform as part of its monitoring of the CKD assessments at baseline , 6 months, 12 months, 18 months (Populations 1 and 2) and end of study (24 months). These evaluations are about compliance, quality of life, anxiety - depression state. To enhance costs the point of view retained will be health insurance's point of view. Among the various costs, only direct costs are considered: disease management, hospitalizations, consultations in hospitals and private practice, prescribed med