Contemporary prospective data on the evolution of macrovascular and late micro vascular complications of type 1 diabetes are limited. The Epidemiology of Diabetes Interventions and Complications (EDIC) study is a multicenter, longitudinal, observational study designed to use the well-characterized DCCT cohort of 1,400 patients to determine the long-term effects of prior separation of glycemic levels on micro- and macrovascular outcomes. EDIC is in its 13th year of followup. The study is expecting to last until 2016.