NCT02486588

Brief Summary

In collaboration with Vitality/Discovery in South Africa, an RCT amongst adult enrolled in the lowest tier of Vitality's HealthyFood benefit will be conducted. We will compare the effect of various messaging, and financial incentive strategies on healthy food purchasing behaviors in this population.

Trial Health

100
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
7,314

participants targeted

Target at P75+ for not_applicable

Timeline
Completed

Started Oct 2015

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

June 29, 2015

Completed
2 days until next milestone

First Posted

Study publicly available on registry

July 1, 2015

Completed
3 months until next milestone

Study Start

First participant enrolled

October 1, 2015

Completed
1.2 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

December 1, 2016

Completed
5 months until next milestone

Study Completion

Last participant's last visit for all outcomes

April 30, 2017

Completed
3.2 years until next milestone

Results Posted

Study results publicly available

July 10, 2020

Completed
Last Updated

July 10, 2020

Status Verified

July 1, 2020

Enrollment Period

1.2 years

First QC Date

June 29, 2015

Results QC Date

February 12, 2019

Last Update Submit

July 9, 2020

Conditions

Purchasing BehaviorsNutrition

Keywords

Financial incentivesMessaging

Outcome Measures

Primary Outcomes (1)

  • Monthly % Healthy Food Expenditure

    The difference in monthly healthy food expenditures between arms. This measure is defined as the monthly amount spent on healthy foods divided by the total monthly amount spent on food, multiplied by 100. For those individuals who had no recorded expenditure in a given month, they will be assigned 0% healthy food expenditure that month; in this way, this outcome can be considered a composite score of being engaged in the healthy food program (0%=not engaged) and the level of engagement (if monthly expenditure \>0). Each individual's data will be averaged across the intervention period.

    Monthly over 6 month intervention period

Secondary Outcomes (7)

  • Monthly % Unhealthy Food Expenditure

    Monthly over 6 month intervention period

  • Monthly % Healthy Items

    Monthly over 6 month intervention period

  • Monthly % Unhealthy Items

    Monthly over 6 month intervention period

  • Percentage Change in Monthly % Healthy Food Expenditures Between Arms

    During the 6 month intervention period

  • Percent Change in Monthly %Unhealthy Food Expenditures Between Arms

    During the 6 month intervention period

  • +2 more secondary outcomes

Study Arms (6)

Control--no weekly message

NO INTERVENTION

10% cash back level, no weekly message, and the standard monthly message

General Weekly Message

EXPERIMENTAL

10% cash back, general weekly message, standard monthly message

Other: MessagingOther: Financial incentives

Personalized Weekly Message

EXPERIMENTAL

10 % cash back, personalized weekly message, standard monthly message

Other: MessagingOther: Financial incentives

25 percent cash back

EXPERIMENTAL

25% cash back, personal weekly message, standard monthly message

Other: MessagingOther: Financial incentives

Standard monthly message

EXPERIMENTAL

10%+15% cash back, personal weekly message, standard monthly message

Other: MessagingOther: Financial incentives

Unbundled monthly message

EXPERIMENTAL

10%+15% cash back, personal weekly message, unbundled monthly message

Other: MessagingOther: Financial incentives

Interventions

MessagingOTHER

See detailed study description for overview of the different messaging interventions in this study

25 percent cash backGeneral Weekly MessagePersonalized Weekly MessageStandard monthly messageUnbundled monthly message
Financial incentivesOTHER

See detailed study description for overview of the different financial incentive-based interventions in this study

25 percent cash backGeneral Weekly MessagePersonalized Weekly MessageStandard monthly messageUnbundled monthly message

Eligibility Criteria

Age18 Years+
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • For this study, we will focus on the following individuals:
  • Adult members of Vitality Health who have activated their HealthyFood benefit in 2014 but have not completed the Vitality Age calculation or Vitality Healthy Check, and therefore are on a 10% cash- back reward level on healthy food purchases.
  • Members who have chosen Woolworths as their preferred HealthyFood partner.
  • Members with an available email address and SMS-capable telephone
  • Members with meeting specified spending cutoff (R1000 total spend in the previous month, at least 90% of which was spent at Woolworth's.)

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Related Publications (1)

  • Gopalan A, Shaw PA, Lim R, Paramanund J, Patel D, Zhu J, Volpp KG, Buttenheim AM. Use of financial incentives and text message feedback to increase healthy food purchases in a grocery store cash back program: a randomized controlled trial. BMC Public Health. 2019 May 31;19(1):674. doi: 10.1186/s12889-019-6936-5.

    PMID: 31151390DERIVED

Results Point of Contact

Title
Anjali Gopalan
Organization
Kaiser Permanente Northern California Division of Research
Anjali.Gopalan@kp.org
510-891-3458

Study Officials

  • Alison Buttenheim, Phd

    University of Pennsylvania

    PRINCIPAL INVESTIGATOR

Publication Agreements

PI is Sponsor Employee
No
Restrictive Agreement
No

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
NONE
Purpose
HEALTH SERVICES RESEARCH
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

June 29, 2015

First Posted

July 1, 2015

Study Start

October 1, 2015

Primary Completion

December 1, 2016

Study Completion

April 30, 2017

Last Updated

July 10, 2020

Results First Posted

July 10, 2020

Record last verified: 2020-07

Data Sharing

IPD Sharing
Will not share