Compared to previous cohorts involving adolescents with T1D, this dataset is unique, due to the longitudinal follow up that is planned in a subset of patients, and because findings form this observational, pilot cohort may be used to identify cardiovascular parameters of interest that could be modified by ACE inhibition/statin therapies being using in the separate cohort of participants currently enrolled in the AdDIT interventional study. Here, ACE is linked to type 1 diabetes mellitus.