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Designing a Natural Experiment to Evaluate a National Health Care–Community Partnership to Prevent Type 2 Diabetes

Large employers (>300 total clients) on UHG’s target list for engagement are randomly assigned to 2 groups: either a group in which participation in DPP is encouraged or to a group in which encouragement to participate is delayed. From the group of employers in which participation is encouraged, eligible clients are identified and participation in DPP begins. The outcomes that will be evaluated for both of the groups are blood cholesterol and hemoglobin A1c; medications for high blood pressure, cholesterol, and glucose; and health care expenditures.

Figure. Cluster randomized encouragement design to be used in the Diabetes Prevention Program (DPP) by UnitedHealth Group (UHG).

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