The base case scenario for the model was a one-off screening for a population aged 45, in
whom type 2 diabetes had not previously been diagnosed. Data for the decision tree—that is,
test sensitivity and specificity and prevalence of impaired glucose tolerance and type 2
diabetes—were taken from the screening those at risk (STAR) study.[24] For this study,
individuals aged 40-75 (white) or 25-75 (non-white) from 15 general practices in
Leicestershire who had at least one recognised risk factor for type 2 diabetes were invited for
screening. Risk factors included a known history of coronary heart disease, hypertension,
dyslipidaemia, cerebrovascular disease, a first-degree relative with type 2 diabetes, and a
body mass index (BMI) >25