2017
DOI: 10.1186/s12966-017-0546-3
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Systematic review of control groups in nutrition education intervention research

Abstract: BackgroundWell-designed research trials are critical for determining the efficacy and effectiveness of nutrition education interventions. To determine whether behavioral and/or cognition changes can be attributed to an intervention, the experimental design must include a control or comparison condition against which outcomes from the experimental group can be compared. Despite the impact different types of control groups can have on study outcomes, the treatment provided to participants in the control conditio… Show more

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Cited by 43 publications
(39 citation statements)
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“…In future studies in this field, it is, therefore, important to consider more objective outcome parameters. Further, offering an active control condition, as opposed to no treatment control, may facilitate blinding ( 53 ). Another major issue possibly contributing to bias in the assessment of outcomes common in the now reviewed studies was an imbalance in baseline characteristics.…”
Section: Discussionmentioning
confidence: 99%
“…In future studies in this field, it is, therefore, important to consider more objective outcome parameters. Further, offering an active control condition, as opposed to no treatment control, may facilitate blinding ( 53 ). Another major issue possibly contributing to bias in the assessment of outcomes common in the now reviewed studies was an imbalance in baseline characteristics.…”
Section: Discussionmentioning
confidence: 99%
“…To overcome the latter, the study design needs to include a control group against which outcomes from the experimental group can be compared in order to minimize biases and variability of factors that may affect intervention outcomes, as well as to determine whether behavioral changes can be attributed to a dietary intervention. The control and experimental conditions must be applied simultaneously to guarantee both groups experience the same conditions such as physical growth [ 20 ]. Without such controls, there is a possibility that changes in the intake of fruits and vegetables as well as in behavioral outcomes may due to the physical growth of children; although the pre-intervention consumptions of fruits and vegetables were not different among the tertiles of the total behavioral scores in the present study.…”
Section: Discussionmentioning
confidence: 99%
“…When the control group waits until the study concludes to receive the intervention it can present limitations. During the waiting period, they may have experiences that may impact study outcomes [ 68 ]. Nevertheless, randomization procedures within the study groups remain the only method that could eliminate possible selection and confounding biases [ 69 ].…”
Section: Discussionmentioning
confidence: 99%