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. 2018 Jan 30;16(1):16.
doi: 10.1186/s12916-017-0984-4.

Economic Evaluation of Type 2 Diabetes Prevention Programmes: Markov Model of Low- And High-Intensity Lifestyle Programmes and Metformin in Participants With Different Categories of Intermediate Hyperglycaemia

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Free PMC article

Economic Evaluation of Type 2 Diabetes Prevention Programmes: Markov Model of Low- And High-Intensity Lifestyle Programmes and Metformin in Participants With Different Categories of Intermediate Hyperglycaemia

Samantha Roberts et al. BMC Med. .
Free PMC article

Abstract

Background: National guidance on preventing type 2 diabetes mellitus (T2DM) in the UK recommends low-intensity lifestyle interventions for individuals with intermediate categories of hyperglycaemia defined in terms of impaired fasting glucose (IFG) or 'at-risk' levels of HbA1c. In a recent systematic review of economic evaluations of such interventions, most studies had evaluated intensive trial-based lifestyle programmes in participants with impaired glucose tolerance (IGT). This study examines the costs and effects of different intensity lifestyle programmes and metformin in participants with different categories of intermediate hyperglycaemia.

Methods: We developed a decision tree and Markov model (50-year horizon) to compare four approaches, namely (1) a low-intensity lifestyle programme based on current NICE guidance, (2) a high-intensity lifestyle programme based on the US Diabetes Prevention Program, (3) metformin, and (4) no intervention, modelled for three different types of intermediate hyperglycaemia (IFG, IGT and HbA1c). A health system perspective was adopted and incremental analysis undertaken at an individual and population-wide level, taking England as a case study.

Results: Low-intensity lifestyle programmes were the most cost-effective (£44/QALY, £195/QALY and £186/QALY compared to no intervention in IGT, IFG and HbA1c, respectively). Intensive lifestyle interventions were also cost-effective compared to no intervention (£2775/QALY, £6820/QALY and £7376/QALY, respectively, in IGT, IFG and HbA1c). Metformin was cost-effective relative to no intervention (£5224/QALY, £6842/QALY and £372/QALY in IGT, IFG and HbA1c, respectively), but was only cost-effective relative to other treatments in participants identified with HbA1c. At a willingness-to-pay threshold of £20,000/QALY, low- and high-intensity lifestyle programmes were cost-effective 98%, 99% and 98% and 81%, 81% and 71% of the time in IGT, IFG and HbA1c, respectively. An England-wide programme for 50-59 year olds could reduce T2DM incidence by < 3.5% over 50 years and would cost 0.2-5.2% of the current diabetes budget for 2-9 years.

Discussion: This analysis suggests that current English national policy of low-intensity lifestyle programmes in participants with IFG or HbA1c will be cost-effective and have the most favourable budget impact, but will prevent only a fraction of cases of T2DM. Additional approaches to prevention need to be investigated urgently.

Keywords: Cost-effective; Diabetes prevention; Economic evaluation; HbA1c in at-risk range; Impaired fasting glucose; Impaired glucose tolerance; Intermediate hyperglycaemia; Prediabetes.

Conflict of interest statement

Ethics approval and consent to participate

No ethical approval was required for this work.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

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Figures

Fig. 1
Fig. 1
State transition diagram
Fig. 2
Fig. 2
Cost-effectiveness plane: incremental cost and QALYs relative to no intervention
Fig. 3
Fig. 3
Annual incremental costs of an England-wide programme
Fig. 4
Fig. 4
Cumulative cost of an England-wide programe

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