- ICH GCP
- Registre américain des essais cliniques
- Essai clinique NCT03567967
Fruit and Vegetable Vouchers With and Without an SSB Tax (EVIDENCE)
The EValuating Interventions in Diabetogenic Environments Through Natural Controlled Experiments (EVIDENCE) Trial
Aperçu de l'étude
Statut
Les conditions
Intervention / Traitement
Description détaillée
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.
Type d'étude
Inscription (Réel)
Phase
- N'est pas applicable
Contacts et emplacements
Lieux d'étude
-
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California
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San Francisco, California, États-Unis, 94158
- University of California
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Stanford, California, États-Unis, 94305
- Stanford University
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
La description
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.
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: La prévention
- Répartition: Randomisé
- Modèle interventionnel: Affectation parallèle
- Masquage: Double
Armes et Interventions
Groupe de participants / Bras |
Intervention / Traitement |
---|---|
Expérimental: 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.
|
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.
Autres noms:
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Comparateur actif: 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.
Autres noms:
|
Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
---|---|---|
Change in fruit and vegetable consumption
Délai: 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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Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
---|---|---|
Change in nutrition quality per HEI score
Délai: Month 0 to Month 6
|
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).
|
Month 0 to Month 6
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Change in nutrition quality per AHEI score
Délai: 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
Délai: 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
Délai: 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
Délai: 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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Collaborateurs et enquêteurs
Parrainer
Collaborateurs
Les enquêteurs
- Chercheur principal: Dean Schillinger, MD, University of California, San Francisco
- Chercheur principal: Sanjay Basu, MD, PhD, Assistant Professor of Medicine
Publications et liens utiles
Liens utiles
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Réel)
Achèvement primaire (Réel)
Achèvement de l'étude (Réel)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Mots clés
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
- 43831
Plan pour les données individuelles des participants (IPD)
Prévoyez-vous de partager les données individuelles des participants (DPI) ?
Informations sur les médicaments et les dispositifs, documents d'étude
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