Condition category
Nutritional, Metabolic, Endocrine
Date applied
21/01/2020
Date assigned
27/01/2020
Last edited
23/01/2020
Prospective/Retrospective
Retrospectively registered
Overall trial status
Completed
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Only about 40% of children in the Netherlands meet daily fruit and vegetable recommendations and roughly 90% of Dutch children exceed the WHO’s daily recommendations of sugar intake, with sweetened beverages and unhealthy snacks being the biggest contributors. Dietary behaviour (e.g. drinking sugar-sweetened beverages) tends to be worse among children from ethnic minority groups.
To stimulate these children’s healthy dietary behaviour, the Public Health Service of Amsterdam implemented an intervention on dietary habits in primary schools in disadvantaged neighbourhoods in Amsterdam where obesity rates tend to be higher. This intervention aims to implement a healthy dietary school policy, and is part of the Jump-in programme that stimulates a range of health behaviours. Although shown to be effective in stimulating physical activity and outside recess play, this study is the first to evaluate Jump-in’s effects on child dietary habits and its implementation processes.

Who can participate?
Children aged 4-12 years old, parents of children aged 4-12 years old, teachers, school project coordinators and school principals at primary schools in Amsterdam that participate in Jump-in after being invited by the Public Health Service of Amsterdam.

What does the study involve?
The Jump-in intervention is tailored to the needs of primary schools. Therefore the programme has a duration of 1 to 3 years. Children and parents are requested to fill in a questionnaire before the programme and 1 and 2 years after the start of the programme. Effectiveness is assessed by questionnaires for the parents, questionnaires for the children, and by digital images of the food and drinks the children brought to school. Interviews are conducted with health promotion professionals, school principals, school project coordinators, and teachers, and focus group discussions are conducted with parents and children.

What are the possible benefits and risks of participating?
The study involves evaluation of the Jump-in intervention and not the implementation itself (i.e. the intervention has been implemented in primary schools in Amsterdam since 2002). Therefore there are no potential risks or benefits for participants.

Where is the study run from?
Public Health Service (GGD) of Amsterdam, Netherlands

When is the study starting and how long is it expected to run for?
July 2016 to September 2019

Who is funding the study?
City of Amsterdam, Amsterdam, Netherlands (Amsterdam Healthy Weight Approach, Sarphati Amsterdam, Public Health Service (GGD))

Who is the main contact?
Miss F.E. Takens
ftakens@ggd.amsterdam.nl

Trial website

Contact information

Type

Scientific

Primary contact

Miss Froukje Takens

ORCID ID

Contact details

Van der Boechorststraat 7
room A312
Amsterdam
1081 BT
Netherlands
+31 (0)619233644
ftakens@ggd.amsterdam.nl

Additional identifiers

EudraCT number

Nil known

ClinicalTrials.gov number

Nil known

Protocol/serial number

Cmg VUmc 2016-1137

Study information

Scientific title

Mixed methods evaluation of the school-based Jump-in intervention on dietary habits

Acronym

Study hypothesis

It is hypothesized that the intervention is effective in stimulating healthy dietary behaviour (i.e. consumption of water or tea without sugar, milk, sweetened beverages, whole-wheat bread, fruit, vegetables and snacks) and behavioural determinants (i.e. attitude, knowledge, social norm, modelling, physical environment, liking and habit formation) among children.

Ethics approval

The implementation of Jump-in in primary schools is part of the usual care of the Public Health Service of Amsterdam and data is collected in accordance with organizational legislation. Prior to data collection, parents receive an information letter about the study and an opt-out option to withdraw their child from participation to the effect evaluation and an opt-in option for the process evaluation.
The use of this data collected by the Public Health Service of Amsterdam was evaluated on 06/09/2016 and amendments were evaluated on 12/01/2017, 10/11/2017 and 18/10/2018 by the Medical Ethical Committee of the Amsterdam UMC (VUmc) (BS7, room H-443, Postbus 7057, 1007 MB Amsterdam, Netherlands; Tel: +31 (0)204445585; Email: metc@vumc.nl). They decided official approval was not required for this study as the Medical Research Involving Human Subject Acts (WMO) did not apply (ref: 2016.415, A2017.007, A2017.421, A2018.078)

Study design

Single-centre interventional quasi-experimental extended selection cohorts design

Primary study design

Interventional

Secondary study design

Non randomised study

Trial setting

Schools

Trial type

Prevention

Patient information sheet

Not available in web format, please use contact details to request participant information sheet

Condition

Dietary behaviour and behavioural determinants

Intervention

The Public Health Service of Amsterdam selected primary schools to participate in Jump-in, and after enrolment, schools were contacted to participate in the current study. Hence, randomization was not possible. A mixed-methods approach is used; to test the effectiveness of the intervention, a quasi-experimental Extended Selection Cohorts design is used, in which intervention and control groups originate from the same schools. The control group is represented by baseline measurements of the same-age groups.

An implementation process of at least 1 school year (max. 3) at schools is facilitated by a team of health promotion professionals who help implement Jump-in, along with other stakeholders such as teachers and the school’s principal.

After a primary school enrols in the Jump-in programme, the health promotion professional organizes meetings with a school principal and a Jump-in coordinator to formulate a tailored plan for the implementation strategy. A school-wide healthy school nutrition policy is implemented at primary schools, which includes that lunchboxes exclusively comprise of fruit and vegetables, whole-wheat bread; drinking water, tea without sugar or milk; and additionally small portion sizes, healthy or non-food treats during special at-school occasions. Additionally, posters and other tools are provided, and workshops are organized about corresponding themes (i.e. water, fruits and vegetables, breakfast and lunch, and treats).

Moreover, Jump-in aims to stimulate physical activity and active school recess play, and is structurally embedded within the Amsterdam Healthy Weight Approach.

The Jump-in intervention is tailored to the needs of primary schools. Therefore the programme has a duration of 1 to 3 years. Children and parents are requested to fill in a questionnaire prior to the implementation of the programme (representing the control group), +- 1 and +-2 years after the start of the implementation (representing intervention groups).

Intervention type

Behavioural

Phase

Drug names

Primary outcome measure

Children’s at-school dietary behaviour (i.e. consumption of water or tea without sugar, milk, sweetened beverages, whole-wheat bread, fruit, vegetables and snacks) assessed by parent, child and teacher questionnaires, and digital images of food and drinks, at baseline, and 1 and 2 years later

Secondary outcome measures

1. Children’s at-home dietary behaviour (i.e. consumption of water or tea without sugar, milk, sweetened beverages, whole-wheat bread, fruit, vegetables and snacks) assessed by parent and child questionnaires at baseline, and 1 and 2 years later
2. Behavioural determinants (i.e. attitude, knowledge, social norm, modelling, physical environment, liking and habit formation) assessed by parent and child questionnaires at baseline, and 1 and 2 years later
3. Process outcomes (process indicators, contextual measures, subjective experience measures) assessed by interviews, focus group discussions, document analysis at 1 and/or 2 years later

Overall trial start date

01/07/2016

Overall trial end date

24/09/2019

Reason abandoned (if study stopped)

Eligibility

Participant inclusion criteria

Children, parents, teachers, project coordinators and school principals who attend one of the schools that were enrolled in the Jump-in intervention in 2016-2017

Participant type

Mixed

Age group

Mixed

Gender

Both

Target number of participants

Target number of primary schools is 10. When 10 primary schools with each 25 students on average per grade participate, the total sample is 2000 children.

Total final enrolment

3475

Participant exclusion criteria

Schools are excluded when they already implemented one or more components of the nutrition policy

Recruitment start date

01/09/2016

Recruitment end date

01/07/2017

Locations

Countries of recruitment

Netherlands

Trial participating centre

Public Health Service (GGD) of Amsterdam
Nieuwe Achtergracht 100
Amsterdam
1018 WT
Netherlands

Sponsor information

Organisation

Public Health Service of Amsterdam, Sarphati Amsterdam

Sponsor details

c/o Prof. dr. Arnoud P. Verhoeff
Nieuwe Achtergracht 100
Amsterdam
1018 WT
Netherlands
+31 (0)205555495
averhoeff@ggd.amsterdam.nl

Sponsor type

Government

Website

www.sarphati.amsterdam

Funders

Funder type

Government

Funder name

City of Amsterdam, Amsterdam, the Netherlands (Amsterdam Healthy Weight Approach, Sarphati Amsterdam, Public Health Service (GGD))

Alternative name(s)

Funding Body Type

Funding Body Subtype

Location

Results and Publications

Publication and dissemination plan

The researchers intend to publish four scientific articles on this evaluation study and will present their findings at conferences, and feed back the information to the policy and professional practices of the Amsterdam Healthy Weight Programme and the dept. of Epidemiology, Health Promotion and Healthcare Innovation (EGZ) due to their relationship to the Jump-in programme.

IPD sharing statement
The datasets generated during and/or analysed during the current study are/will be available upon request from F.E. Takens (ftakens@ggd.amsterdam.nl).

Intention to publish date

01/02/2020

Participant level data

Available on request

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

22/01/2020: Trial's existence confirmed by the Medical Ethics committee of VU University Medical Center.