ABSTRACT
Objectives. To estimate the population-level effectiveness and cost-effectiveness of a subsidized community-supported agriculture (CSA) intervention in the United States.Methods. In 2019, we developed a microsimulation model from nationally representative demographic, biomedical, and dietary data (National Health and Nutrition Examination Survey, 2013-2016) and a community-based randomized trial (conducted in Massachusetts from 2017 to 2018). We modeled 2 interventions: unconditional cash transfer ($300/year) and subsidized CSA ($300/year subsidy).Results. The total discounted disability-adjusted life years (DALYs) accumulated over the life course to cardiovascular disease and diabetes complications would be reduced from 24 797 per 10 000 people (95% confidence interval [CI] = 24 584, 25 001) at baseline to 23 463 per 10 000 (95% CI = 23 241, 23 666) under the cash intervention and 22 304 per 10 000 (95% CI = 22 084, 22 510) under the CSA intervention. From a societal perspective and over a life-course time horizon, the interventions had negative incremental cost-effectiveness ratios, implying cost savings to society of -$191 100 per DALY averted (95% CI = -$191 767, -$188 919) for the cash intervention and -$93 182 per DALY averted (95% CI = -$93 707, -$92 503) for the CSA intervention.Conclusions. Both the cash transfer and subsidized CSA may be important public health interventions for low-income persons in the United States.
Subject(s)
Agriculture/organization & administration , Community Participation/methods , Food Supply/methods , Health Status , Poverty , Public Assistance/statistics & numerical data , Adult , Aged , Agriculture/economics , Cardiovascular Diseases/economics , Cardiovascular Diseases/prevention & control , Community Participation/economics , Cost-Benefit Analysis , Diabetes Complications/economics , Diabetes Complications/prevention & control , Diet , Female , Food Supply/economics , Humans , Male , Middle Aged , Models, Economic , Nutrition Surveys , Public Assistance/economics , Social Environment , Socioeconomic FactorsABSTRACT
INTRODUCTION: Socioeconomically vulnerable individuals often face poor access to nutritious food and bear a disproportionate burden of diet-related chronic illness. This study tested whether a subsidized community-supported agriculture intervention could improve diet quality. STUDY DESIGN: An RCT was conducted from May 2017 to December 2018 (data analyzed in 2019). SETTING/PARTICIPANTS: Adults with a BMI >25 kg/m2 seen at a community health center in central Massachusetts, or who lived in the surrounding county, were eligible. INTERVENTION: Individuals were randomized to receive either subsidized community-supported agriculture membership (which provided a weekly farm produce pickup from June to November) or healthy eating information (control group). For equity, the control group received financial incentives similar to the intervention group. MAIN OUTCOME MEASURES: The primary outcome was the Healthy Eating Index 2010 total score (range, 0-100; higher indicates better diet quality; minimum clinically meaningful difference, 3). Healthy Eating Index was assessed using 3 24-hour recalls per participant collected each growing season. Intention-to-treat analyses compared Healthy Eating Index scores between the intervention and control group, accounting for repeated measures with generalized estimating equations. RESULTS: There were 128 participants enrolled and 122 participants for analysis. The participants' mean age was 50.3 (SD=13.6) years; 82% were women; and 88% were white, non-Hispanic, with a similar distribution of baseline characteristics comparing the intervention and control groups. Baseline Healthy Eating Index total score was 53.9 (SD=15.3) in the control group and 55.1 (SD=15.2) in the intervention group (p=0.68). The intervention increased the mean Healthy Eating Index total score relative to the control group (4.3 points higher, 95% CI=0.5, 8.1, p=0.03). Food insecurity was lower in the intervention group (RR=0.68, 95% CI=0.48, 0.96). CONCLUSIONS: A community-supported agriculture intervention resulted in clinically meaningful improvements in diet quality. Subsidized community-supported agriculture may be an important intervention for vulnerable individuals. TRIAL REGISTRATION: This study is registered at www.clinicaltrials.gov NCT03231592. SUPPLEMENT INFORMATION: This article is part of a supplement entitled Identifying and Intervening on Social Needs in Clinical Settings: Evidence and Evidence Gaps, which is sponsored by the Agency for Healthcare Research and Quality of the U.S. Department of Health and Human Services, Kaiser Permanente, and the Robert Wood Johnson Foundation.
