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The effect of sugar-sweetened beverages on preschool children’s behaviour and cognition
Last registered on May 03, 2018

Pre-Trial

Trial Information
General Information
Title
The effect of sugar-sweetened beverages on preschool children’s behaviour and cognition
RCT ID
AEARCTR-0002782
Initial registration date
May 02, 2018
Last updated
May 03, 2018 12:04 PM EDT
Location(s)
Region
Primary Investigator
Affiliation
KU Leuven
Other Primary Investigator(s)
PI Affiliation
KU Leuven
Additional Trial Information
Status
Completed
Start date
2017-03-07
End date
2018-03-31
Secondary IDs
Abstract
It is a widely held belief that the consumption of sugar-sweetened beverages (SSBs) instigates a ‘sugar rush’ that improves the performance, followed by a ‘sugar crash’ which diminishes the performance. In an educational context, this relationship suggests an important role of diet and nutrition in influencing a student’s performance. To test this relationship, two randomized field experiments were set up, with 399 preschool children in 25 classes. The children were randomized within classes into treatment (SSB) and control (artificially sweetened beverage) groups. The cognition and behaviour was tested before and after the treatment in a double-blind manner.
External Link(s)
Registration Citation
Citation
Schiltz, Fritz and Kristof Witte. 2018. "The effect of sugar-sweetened beverages on preschool children’s behaviour and cognition." AEA RCT Registry. May 03. https://doi.org/10.1257/rct.2782-1.0.
Former Citation
Schiltz, Fritz, Fritz Schiltz and Kristof Witte. 2018. "The effect of sugar-sweetened beverages on preschool children’s behaviour and cognition." AEA RCT Registry. May 03. http://www.socialscienceregistry.org/trials/2782/history/29064.
Experimental Details
Interventions
Intervention(s)
The children assigned to the treatment group were given a sugar-sweetened beverage (equivalent to a can of soda). The control group received a placebo substance of the same volume that contained artificial sweeteners.
Intervention Start Date
2017-03-07
Intervention End Date
2017-11-28
Primary Outcomes
Primary Outcomes (end points)
Cognitive test scores (mathematics)
Behavioral assessments
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The children were randomized within classes into treatment (SSB) and control (artificially sweetened beverage) groups. The cognition and behaviour was tested before and after the treatment in a double-blind manner.
Experimental Design Details
The children were randomized within classes into treatment (SSB) and control (artificially sweetened beverage) groups. The cognition and behaviour was tested before and after the treatment in a double-blind manner. In order to accommodate the differential effects of drinking SSBs over time, it was administered at four time points and these were: after 30 minutes, 45 minutes, 60 minutes, or 120 minutes. Irrespective of the moment of testing assigned to the class, all children in a class were tested before the intervention (baseline). Between the first and second test, the teachers were instructed to continue their classes as before in order to evaluate a realistic intervention, where the preschool children drink sugar-sweetened beverages at school
Randomization Method
Random number generator
Randomization Unit
Individual level for treatment
Class level for timing of treatment
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
25 classes
Sample size: planned number of observations
399 students
Sample size (or number of clusters) by treatment arms
Treatment=197
Control=202
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Unit=cognitive test score (out of 23) Minimum detectable effect size= -0.14 SD=3.48 Percentage=1.2% Unit=behavioral assessment (out of 7) Minimum detectable effect size=0.14 SD=0.99 Percentage=5.2%
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
IRB Approval Date
IRB Approval Number
Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is data collection complete?
Data Publication
Data Publication
Is public data available?
No
Program Files
Program Files
Reports, Papers & Other Materials
Relevant Paper(s)
REPORTS & OTHER MATERIALS