Variables Values Source
Cost of Group-based lifestyle intervention (GL) £173 13
Cost of usual care (UC) £147 14
Cost of diabetes without complications £115 9, 18
Cost of diabetes with complications £2120 9,18
Probability of uptake in GL 0.53 12
Probability of BMI loss achieved in GL 0.40 13
Probability of BMI loss achieved in UC 0.15 13
Utility scores of BMI loss achieved 0.80 9, 18, 19 
Utility scores of no BMI loss achieved 0.67 9, 19
Table 1: Parameters used in the model (£2013 prices).