Journal
DIABETIC MEDICINE
Volume 30, Issue 3, Pages 300-308Publisher
WILEY
DOI: 10.1111/dme.12047
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Funding
- Wellcome Trust through the Scottish Health Informatics Programme (SHIP) Grant [WT086113]
- Scottish Government
- NHS Research Scotland (NRS) through the Scottish Diabetes Research Network
- Glaxo Smith Kline
- Takeda
- Sanofi
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Aims To describe the proportion of people with Type2 diabetes living in Scotland who meet eligibility criteria for inclusion in several large randomized controlled trials of glycaemic control to inform physicians and guideline developers about the generalizibility of trial results. Methods A literature review was performed to identify large trials assessing the impact of glycaemic control on risk of macrovascular disease. Inclusion and exclusion criteria from each trial were applied to data on the population of people with a diagnosis of Type2 diabetes living in Scotland in 2008 (n=180590) in a population-based cross-sectional study and the number and proportion of people eligible for each trial was determined. Results Seven trials were identified. The proportion of people with Type2 diabetes who met the eligibility criteria for the trials ranged from 3.5 to 50.7%. Trial participants were younger at age of diagnosis of diabetes and at time of trial recruitment than in the Scottish study population. The application of upper age criteria excluded the largest proportion of patients, with up to 39% of people with Type2 diabetes ineligible for a trial with the most stringent criteria based on age alone. Conclusions We found that many of the large trials of glycaemic control among people with Type2 diabetes have limited external validity when applied to a population-based cohort of people with Type2 diabetes. In particular, the age distribution of trial participants often does not reflect that of people with Type2 diabetes in a contemporary British population.
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