Comment on Ely et al. A National Effort to Prevent Type 2 Diabetes: Participant-Level Evaluation of CDC's National Diabetes Prevention Program. Diabetes Care 2017;40:1331-1341

The effects of financial incentives on diabetes prevention program attendance and weight loss among low-income patients: the We Can Prevent Diabetes cluster-randomized controlled trial

BACKGROUND

Penetration and participation of real life implementation of lifestyle change programs to prevent type 2 diabetes has been challenging. This is particularly so among low income individuals in the United States. The purpose of this study is to examine the effectiveness of financial incentives on attendance and weight loss among Medicaid beneficiaries participating in the 12-month Diabetes Prevention Program (DPP).

METHODS

This is a cluster-randomized controlled trial with two financial incentive study arms and an attention control study arm. Medicaid beneficiaries with prediabetes from 13 primary care clinics were randomly assigned to individually earned incentives (IND; 33 groups; n = 309), a hybrid of individual- and group-earned incentives (GRP; 30 groups; n = 259), and an attention control (AC; 30 groups; n = 279). Up to $520 in incentives could be earned for attaining attendance and weight loss goals over 12 months. Outcomes are percent weight loss from baseline, achieving 5% weight loss from baseline, and attending 75% of core and 75% of maintenance DPP sessions. Linear mixed models were used to examine weight change and attendance rates over the 16 weeks and 12 months.

RESULTS

The percent weight change at 16 weeks for the IND, GRP, and AC participants were similar, at - 2.6, - 3.1%, and - 3.4%, respectively. However, participants achieving 5% weight loss in the IND, GRP, and AC groups was 21.5, 24.0% (GRP vs AC, P < 0.05), and 15.2%. Attendance at 75% of the DPP core sessions was significantly higher among IND (60.8%, P < 0.001) and GRP (64.0%, P < 0.001) participants than among AC (38.6%) participants. Despite substantial attrition over time, attendance at 75% of the DPP maintenance sessions was also significantly higher among IND (23.0%, P < 0.001) and GRP (26.1%, P < 0.001) participants than among AC (11.0%) participants.

CONCLUSIONS

Financial incentives can improve the proportion of Medicaid beneficiaries attending the 12-month DPP and achieving at least 5% weight loss.

TRIAL REGISTRATION

ClinicalTrials.gov NCT02422420 ; retrospectively registered April 21, 2015.

The Reach of an Urban Hospital System-Based Diabetes Prevention Program: Patient Engagement and Weight Loss Characteristics

PURPOSE

The purpose of this study was to identify patient and program delivery characteristics associated with engagement and weight loss in a Diabetes Prevention Program (DPP) implemented in an urban hospital system.

METHODS

Patient and program delivery data were collected between July 2015 and December 2017. DPP eligibility was determined based on age, body mass index (BMI), and hemoglobin A1C data via the electronic health record. Engagement was measured at 3 levels: ≤3 sessions, 4 to 8 sessions, and ≥9 sessions. Weight was measured at each DPP session.

RESULTS

Among the eligible patients (N = 31 524), referrals and engagement were lower in men than women, in Spanish speakers than English speakers, in younger (18-34 years) and middle-aged (35-54 years) than older adults, and in patients receiving Medicaid than other patients. Referral and engagement were higher in patients with higher BMIs and those prescribed ≥5 medications. Current smokers were less frequently engaged. Prior health care provider contact was associated with higher engagement. Overall, 28% of DPP participants achieved ≥5% weight loss; younger and middle-aged patients and those who gained weight in the prior 2 years were less likely to lose weight.

CONCLUSION

This assessment identified characteristics of patients with lower levels of referral and engagement. The DPP staff may need to increase outreach to address barriers to referral and during all points of engagement among men, younger patients, and Spanish speakers. Future research is needed to increase understanding with regard to why referrals and engagement are lower among these groups.

Cost-Effectiveness of a Community-Based Diabetes Prevention Program with Participation Incentives for Medicaid Beneficiaries

OBJECTIVE

To examine the cost-effectiveness of a community-based Diabetes Prevention Program (DPP) for Medicaid beneficiaries from the perspective of the health care sector.

DATA SOURCES/STUDY SETTING

A total of 847 Medicaid enrollees at high risk for type 2 diabetes participating in a community-based DPP.

STUDY DESIGN

Pre- and post clinical outcome and cost data were used as inputs into a validated diabetes simulation model. The model was used to evaluate quality-adjusted life years (QALYs) and health care costs over a 40-year time horizon from the perspective of the health care sector.

DATA COLLECTION/EXTRACTION METHODS

Clinical outcome and cost data were derived from a study examining the effect of financial incentives on weight loss.

PRINCIPAL FINDINGS

Study participants lost an average of 4.2 lb (p < .001) and increased high-density lipoprotein cholesterol by 1.75 mg/dl (p = .002). Intervention costs, which included financial incentives for participation and weight loss, were $915 per participant. The incremental cost-effectiveness ratio was estimated to be $14,011 per QALY but was sensitive to the time horizon studied.

CONCLUSIONS

Widespread adoption of community-based DPP has the potential to reduce diabetes and cardiovascular-related morbidity and mortality for low-income persons at high risk for diabetes and may be a cost-effective investment for Medicaid programs.