You are not logged in.
Openly accessible

The impact of financial incentives on participants' food purchasing patterns in a supermarket-based randomized controlled trial

Olstad, Dana Lee, Crawford, David A., Abbott, Gavin, McNaughton, Sarah A., Le, Ha ND, Ni Mhurchu, Cliona, Pollard, Christina and Ball, Kylie 2017, The impact of financial incentives on participants' food purchasing patterns in a supermarket-based randomized controlled trial, International journal of behavioral nutrition and physical activity, vol. 14, no. 115, pp. 1-7, doi: 10.1186/s12966-017-0573-0.

Attached Files
Name Description MIMEType Size Downloads
olstad-theimpactof-2017.pdf Published version application/pdf 429.41KB 8

Title The impact of financial incentives on participants' food purchasing patterns in a supermarket-based randomized controlled trial
Author(s) Olstad, Dana Lee
Crawford, David A.ORCID iD for Crawford, David A. orcid.org/0000-0002-2467-7556
Abbott, GavinORCID iD for Abbott, Gavin orcid.org/0000-0003-4014-0705
McNaughton, Sarah A.ORCID iD for McNaughton, Sarah A. orcid.org/0000-0001-5936-9820
Le, Ha ND
Ni Mhurchu, Cliona
Pollard, Christina
Ball, KylieORCID iD for Ball, Kylie orcid.org/0000-0003-2893-8415
Journal name International journal of behavioral nutrition and physical activity
Volume number 14
Issue number 115
Start page 1
End page 7
Total pages 7
Publisher BioMed Central
Place of publication London, Eng.
Publication date 2017
ISSN 1479-5868
Keyword(s) Food purchasing
Fruits and vegetables
Price reductions
Randomized controlled trial
Supermarket
Science & Technology
Life Sciences & Biomedicine
Nutrition & Dietetics
Physiology
NUTRITION EDUCATION
PRICE DISCOUNTS
UNITED-STATES
HEALTHY FOOD
PERSPECTIVE
CONSUMPTION
POPULATION
PROGRAM
COST
Summary Background
The impacts of supermarket-based nutrition promotion interventions might be overestimated if participants shift their proportionate food purchasing away from their usual stores. This study quantified whether participants who received price discounts on fruits and vegetables (FV) in the Supermarket Healthy Eating for Life (SHELf) randomized controlled trial (RCT) shifted their FV purchasing into study supermarkets during the intervention period.

Methods
Participants were 642 females randomly assigned to a 1) skill-building (n = 160), 2) price reduction (n = 161), 3) combined skill-building and price reduction (n = 160), or 4) control (n = 161) group. Participants self-reported the proportion of FV purchased in study supermarkets at baseline, 3- and 6-months post-intervention. Fisher’s exact and χ2 tests assessed differences among groups in the proportion of FV purchased in study supermarkets at each time point. Multinomial logistic regression assessed differences among groups in the change in proportionate FV purchasing over time.

Results
Post-intervention, 49% of participants purchased ≥50% of their FV in study supermarkets. Compared to all other groups, the price reduction group was approximately twice as likely (RRR: 1.8-2.2) to have increased proportionate purchasing of FV in study supermarkets from baseline to post-intervention (p< 0.05).

Conclusions
Participants who received price reductions on FV were approximately twice as likely to shift their FV purchasing from other stores into study supermarkets during the intervention period. Unless food purchasing data are available for all sources, differential changes in purchasing patterns can make it difficult to discern the true impacts of nutrition interventions.
Language eng
DOI 10.1186/s12966-017-0573-0
Field of Research 111199 Nutrition and Dietetics not elsewhere classified
11 Medical And Health Sciences
13 Education
Socio Economic Objective 920411 Nutrition
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID NHMRC 594767
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30102428

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
Open Access Collection
Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in TR Web of Science
Scopus Citation Count Cited 0 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 42 Abstract Views, 6 File Downloads  -  Detailed Statistics
Created: Wed, 30 Aug 2017, 16:23:00 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.