Participants
We included 18 168 people with type 1 diabetes entered in the Swedish National Diabetes Register for whom data were available about the use of insulin pump therapy or multiple daily injections. A total of 2441 people were being treated with insulin pump therapy during the study period from baseline to the final year, and 15,727 were treated with multiple daily injections during the whole study period to final year. Type 1 diabetes was epidemiologically defined as all patients who received insulin treatment only (for diabetes mellitus) and were aged under 30 at onset, almost all of whom had been
reported by outpatient clinics from about 90 Swedish hospitals. Baseline appointments took place in 2005-07 with follow-up until 31 December 2012. Treatment with insulin pump has been documented in the register since the year 2004. All individuals were recruited from the Swedish National Diabetes Register with no exclusion criteria.