Welcome
Support Centre
01 September 2014 
ISRCTN Register - International Standard Randomized Controlled Trial Number
Trial registration
Unique identification scheme
International databases
home  |   my details  |   ISRCTN Register  |   mRCT  |   links  |   information  |   news
Find trials
ISRCTN Register
tips on searching

Registration
New application
Updating record

Information
introduction
governing board
ISRCTN FAQs
data set
letter of agreement
request information
guidance notes
statistics

[ Print-friendly version ]
The influence of incentives on children's consumption of vegetables
ISRCTN ISRCTN42922680
DOI 10.1186/ISRCTN42922680
ClinicalTrials.gov identifier
EudraCT number
Public title The influence of incentives on children's consumption of vegetables
Scientific title The influence of incentives on children's consumption of vegetables: a randomised controlled multi-centre trial
Acronym N/A
Serial number at source MRC ref: G0701864
Study hypothesis 1. In children, are verbal rewards more effective than tangible rewards for increasing consumption of a target food, and for persistent changes in liking?
2. To what extent are the known benefits of ‘mere exposure’ dependent on verbal rewards?
Lay summary Not provided at time of registration
Ethics approval University College London (UCL) Research Ethics Committee, approved on 28/11/2008 (ref: 1715/001)
Study design Randomised controlled multi-centre trial
Countries of recruitment United Kingdom
Disease/condition/study domain Children's nutrition
Participants - inclusion criteria Children (both males and females) in Reception and Year 1 classes in primary schools
Participants - exclusion criteria Significant learning difficulties or insufficient command on English language to participate in tasting sessions.
Anticipated start date 01/11/2008
Anticipated end date 15/09/2009
Status of trial Completed
Patient information material Not available in web format, please use the contact details below to request a patient information sheet
Target number of participants 448
Interventions Classes will be randomly assigned to one of four experimental conditions. All children will participate in a pre-intervention taste test at which a target vegetable will be identified for each child.

Four conditions are:
Control: The children will not be required to taste their target vegetable during the training stage, with no testing taking place between pre and post tests.

No reward (exposure) condition: The children will be asked to taste their target vegetable once daily for 13 school days. These tasting sessions will not be rewarded.

Immediate tangible reward condition: The children will be asked to taste their target vegetable once daily for 13 school days. This group will immediately receive a tangible reward (one sticker of their choice) for tasting their target vegetable.

Immediate verbal reward condition: The children will be asked to taste their target vegetable once daily for 13 school days. This group will immediately be praised for tasting their target vegetable.
Primary outcome measure(s) The following will be assessed at a post-intervention taste test and 1 and 3 months post-intervention:
1. Children's liking (faces scale: "Yucky" = 1, "OK" = 2, "Yummy" = 3)
2. Ranking: Forced choice ranking of target vegetable from 1 (most liked) to 6 (least liked)
3. Consumption (g) of a target vegetable
Secondary outcome measure(s) Liking and frequency of consumption of a range of vegetables as reported by a parent using food frequency and food preference questionnaires at baseline and both follow-ups (1 month and 3 months post-intervention).
Sources of funding Medical Research Council (MRC) - National Prevention Research Initiative (NPRI) (UK) (ref: G0701864)
Trial website
Publications 1. 2012 results in http://www.ncbi.nlm.nih.gov/pubmed/22158728
Contact name Dr  Lucy  Cooke
  Address Health Behaviour Research Centre
University College London (UCL)
Brook House
2-16 Torrington Place
  City/town London
  Zip/Postcode WC1E 7HN
  Country United Kingdom
  Tel +44 (0)20 7679 0976
  Email lucy.cooke@ucl.ac.uk
Sponsor Medical Research Council (MRC) - National Prevention Research Initiative (NPRI) (UK)
  Address 20 Park Crescent
  City/town London
  Zip/Postcode W1B 1AL
  Country United Kingdom
  Tel +44 (0)20 7670 5485
  Email marlie.ferenczi@headoffice.mrc.ac.uk
  Sponsor website: http://www.mrc.ac.uk
Date applied 22/01/2009
Last edited 21/02/2012
Date ISRCTN assigned 27/02/2009
Submit your trial protocol
Submit to Trials journal
Follow us on Twitter
© 2014 ISRCTN unless otherwise stated.