Inclusion Criteria:  T1D>12 months 6-18 years old prior to inclusion Followed at the Pediatric Diabetes outpatient clinic at Steno Diabetes Center Copenhagen Speaks and reads Danish well enough to understanding the given oral and written information. There is a written consent from the guardianship holder/holders for the child.  Exclusion Criteria:  T1D < 12 months Known cardiovascular disease Antihypertensive treatment