Achieved levels of HbA1c and likelihood of hospital admission in people with type 1 diabetes in the Scottish population: a study from the Scottish Diabetes Research Network Epidemiology Group.

People with type 1 diabetes have increased risk of hospital admission compared with those without diabetes. We hypothesized that HbA(1c) would be an important indicator of risk of hospital admission. The Scottish Care Information-Diabetes Collaboration, a dynamic national register of diagnosed cases of diabetes in Scotland, was linked to national data on admissions. We identified 24,750 people with type 1 diabetes during January 2005 to December 2007. We assessed the relationship between deciles of mean HbA(1c) and hospital admissions in people with type 1 diabetes adjusting for patient characteristics. There were 3,229 hospital admissions. Of the admissions, 8.1% of people had mean HbA(1c) 10.8%/95 mmol/mol) were at particularly high risk. There is the need to develop effective interventions to reduce this risk.