The influence of incentives on children's consumption of vegetables
| ISRCTN | ISRCTN42922680 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN42922680 |
| Protocol serial number | MRC ref: G0701864 |
| Sponsor | Medical Research Council (MRC) - National Prevention Research Initiative (NPRI) (UK) |
| Funder | Medical Research Council (MRC) - National Prevention Research Initiative (NPRI) (UK) (ref: G0701864) |
- Submission date
- 22/01/2009
- Registration date
- 27/02/2009
- Last edited
- 21/02/2012
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Nutritional, Metabolic, Endocrine
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Plain English summary of protocol
Not provided at time of registration
Contact information
Dr Lucy Cooke
Scientific
Scientific
Health Behaviour Research Centre
University College London (UCL)
Brook House
2-16 Torrington Place
London
WC1E 7HN
United Kingdom
| Phone | +44 (0)20 7679 0976 |
|---|---|
| lucy.cooke@ucl.ac.uk |
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Randomised controlled multi-centre trial |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | The influence of incentives on children's consumption of vegetables: a randomised controlled multi-centre trial |
| Study objectives | 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? |
| Ethics approval(s) | University College London (UCL) Research Ethics Committee, approved on 28/11/2008 (ref: 1715/001) |
| Health condition(s) or problem(s) studied | Children's nutrition |
| Intervention | 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. |
| Intervention type | Other |
| Primary outcome measure(s) |
The following will be assessed at a post-intervention taste test and 1 and 3 months post-intervention: |
| Key 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). |
| Completion date | 15/09/2009 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Child |
| Sex | All |
| Target sample size at registration | 448 |
| Key inclusion criteria | Children (both males and females) in Reception and Year 1 classes in primary schools |
| Key exclusion criteria | Significant learning difficulties or insufficient command on English language to participate in tasting sessions. |
| Date of first enrolment | 01/11/2008 |
| Date of final enrolment | 15/09/2009 |
Locations
Countries of recruitment
- United Kingdom
- England
Study participating centre
Health Behaviour Research Centre
London
WC1E 7HN
United Kingdom
WC1E 7HN
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | No |
|---|---|
| IPD sharing plan summary | Not provided at time of registration |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | results | 01/01/2012 | Yes | No | |
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
