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- Klinische proef NCT03567967
Fruit and Vegetable Vouchers With and Without an SSB Tax (EVIDENCE)
The EValuating Interventions in Diabetogenic Environments Through Natural Controlled Experiments (EVIDENCE) Trial
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Gedetailleerde beschrijving
We will test the hypothesis that a positive incentive for healthy foods (fresh fruits and vegetables, F&Vs) will be utilized as effectively in a community without a purchasing penalty for unhealthy foods (a sugar-sweetened beverage [SSB] tax) as in a community with a purchasing penalty for unhealthy foods (a SSB tax). Our experiment will test the empirically-driven hypothesis in a real-world setting through a noninferiority design: comparing the impact of F&V vouchers in two counties, one without (Los Angeles) and one with (San Francisco) a SSB tax.
Each study participant will receive four paper vouchers per month for a total of six months. Each of these vouchers can be redeemed for fresh or frozen fruits and vegetables at a number of specified local corner stores, supermarkets, or farmer's markets.
Half of these participants will receive and spend these vouchers in an environment which has implemented a SSB tax (SF); the other half will receive and spend these same vouchers in a non-tax environment (LA).
Each individual participant will be enrolled in the study for a total of seven months from initial orientation and participant consent (M0) to final data collection during final month of intervention (M6).
We are using a non-inferiority trial design. We are aiming to test whether there is a significant difference in total cup-equivalents of F&V intake in LA participants as compared to SF participants when given F&V vouchers. That is, we aim to test whether the F&V voucher is less effective in LA than in SF. This is important to test because it has been purported that SF has a unique food environment with high accessibility to fresh F&V through farmer's markets and a plethora of corner stores, as well as a SSB tax that discourages less healthy foods, potentially leaving more funds for healthier F&Vs. Thus, we aim to determine the change in consumption of F&V in LA participants is non-inferiority to that of SF participants, when both are given F&V vouchers.
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
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California
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San Francisco, California, Verenigde Staten, 94158
- University of California
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Stanford, California, Verenigde Staten, 94305
- Stanford University
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- Understand English sufficiently to provide informed consent;
- Provision of signed and dated informed consent form;
- Stated willingness to comply with all study procedures and availability for the duration of the study;
- Any gender, aged 21 years or older;
- Have self-reported income ≤250% of the federal poverty level;
- Have regular access to a mobile phone;
- Have a safe and secure mailing address at which to receive vouchers;
- Be a resident of the Counties of San Francisco or Los Angeles as defined by official municipal boundaries.
Exclusion Criteria:
- Currently participating in any other dietary or nutrition study that would impact his or her normal eating patterns;
- Currently be enrolled in and receiving EatSF, CHIVES, or Vouchers4Veggies vouchers;
- Has active diagnosis of cancer or congestive heart failure;
- Is planning to move out of San Francisco or Los Angeles in the next 12 months;
- Currently pregnant.
- Currently live with and share a food budget with a current Vouchers4Veggies, EVIDENCE, or CHIVES study participant.
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Preventie
- Toewijzing: Gerandomiseerd
- Interventioneel model: Parallelle opdracht
- Masker: Dubbele
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Experimenteel: San Francisco
Each study participant will receive four paper vouchers per month for a total of six months.
Each of these vouchers can be redeemed for fresh or frozen fruits and vegetables at a number of specified local corner stores, supermarkets, or farmer's markets.
The San Francisco participants will receive and spend these vouchers in an environment which has implemented a sugar-sweetened beverage tax.
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Participants will receive four vouchers, each dated for a month, to be used on fruits and vegetables at specified local corner stores, supermarkets, and farmer's markets for a duration of six months.
Each study participant will have the same intervention, as this is a non-inferiority trial to compare voucher use in LA and test whether the nutritional effects of that use are non-inferior to use in SF.
Andere namen:
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Actieve vergelijker: Los Angeles
Each study participant will receive four paper vouchers per month for a total of six months.
Each of these vouchers can be redeemed for fresh or frozen fruits and vegetables at a number of specified local corner stores, supermarkets, or farmer's markets.
The Los Angeles participants will receive and spend these vouchers in an environment which has NOT implemented a sugar-sweetened beverage tax.
|
Participants will receive four vouchers, each dated for a month, to be used on fruits and vegetables at specified local corner stores, supermarkets, and farmer's markets for a duration of six months.
Each study participant will have the same intervention, as this is a non-inferiority trial to compare voucher use in LA and test whether the nutritional effects of that use are non-inferior to use in SF.
Andere namen:
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Change in fruit and vegetable consumption
Tijdsspanne: Month 0 to Month 6
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Change in fruit and vegetable consumption from baseline (BL), i.e., before voucher receipt, to the end of the intervention at the end of month 6 (M6), i.e., during the final month of voucher receipt, measured by two 24-hour recalls at each data collection point (BL and M6).
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Month 0 to Month 6
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
---|---|---|
Change in nutrition quality per HEI score
Tijdsspanne: Month 0 to Month 6
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Change in nutrition quality of study participants from BL to M6, measured by the Healthy Eating Index (HEI), which is calculated from two 24-hour recalls at each data collection point (BL and M6).
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Month 0 to Month 6
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Change in nutrition quality per AHEI score
Tijdsspanne: Month 0 to Month 6
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Change in nutrition quality of study participants from BL to M6, measured by the Alternative Healthy Eating Index (AHEI), which is calculated from two 24-hour recalls at each data collection point (BL and M6).
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Month 0 to Month 6
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Change in SSB consumption
Tijdsspanne: Month 0 to Month 6
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Change in SSB consumption from BL to M6, measured in change in fluid ounces, as measured by two 24-hour recalls at each data collection point (BL and M6).
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Month 0 to Month 6
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Change in overall caloric intake
Tijdsspanne: Month 0 to Month 6
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Change in overall caloric intake from BL to M6, measured in change in kcal, as measured by two 24-hour dietary recalls at each data collection point (BL and M6).
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Month 0 to Month 6
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Overall percentage of vouchers redeemed
Tijdsspanne: Month 0 to Month 6
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Overall percentage of vouchers redeemed per participant, measured by how many vouchers each participant redeemed as compared to how many vouchers they received over the 6 month intervention period.
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Month 0 to Month 6
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Medewerkers en onderzoekers
Sponsor
Medewerkers
Onderzoekers
- Hoofdonderzoeker: Dean Schillinger, MD, University of California, San Francisco
- Hoofdonderzoeker: Sanjay Basu, MD, PhD, Assistant Professor of Medicine
Publicaties en nuttige links
Nuttige links
Studie record data
Bestudeer belangrijke data
Studie start (Werkelijk)
Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Werkelijk)
Updates van studierecords
Laatste update geplaatst (Werkelijk)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Aanvullende relevante MeSH-voorwaarden
Andere studie-ID-nummers
- 43831
Plan Individuele Deelnemersgegevens (IPD)
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Informatie over medicijnen en apparaten, studiedocumenten
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