Efficacy of Portion Size Measurement Aids

Study Overview
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Brief Summary
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Portion size measurement aids (PSMAs) are tools that facilitate the estimation of food servings. The objectives of this study are to determine (a) if food portion size estimation accuracy differs when using a two dimensional (2D) PSMA (actual-size photos called Portion Size Cards) compared to a 3D PSMA (Portion Size Kit) and (b) whether differences exist in the short-term usefulness of and satisfaction with these PSMAs in a sample of parents of overweight children and youth. We hypothesize that the group that receives the 3D PSMAs will be more accurate in food portion size estimation and will be more satisfied with the tool compared to the group that receives the 2D PSMAs.

Detailed Description
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Forty primary caregivers of overweight children and youth attending the Pediatric Centre for Weight and Health (Edmonton, AB) will be recruited. Participants will be randomly assigned to one of the two groups (2D PSMAs versus 3D PSMAs). After a brief explanation of the respective tool, participants will estimate the volumes of pre-measured rubber food portion models on a test plate. Participants will then be given the 2D or 3D PSMAs to take home with them to use in the real-world. After 2-4 weeks, participants will be telephoned by the research team to complete a brief survey to evaluate their usefulness of and satisfaction with the 2D or 3D PSMAs at home.

Official Title
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Exploring the Accuracy and Acceptability of Portion Size Measurement Aids in Parents of Overweight Children

Conditions
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Nutrition Assessment, Obesity

Intervention / Treatment
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* Behavioral: Portion Size Measurement Aids (PSMAs)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Participants must be primary caregivers of children or youth attending a clinical appointment for weight management (clients must have a BMI greater or equal to the 85th percentile at this clinic) Participants must be literate and fluent in English Exclusion Criteria: Any participant who does not meet the above criteria Participants must not have had any previous education or resources on food portion sizes at this clinic
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 2D Portion Size Measurment Aids (PSMAs)<br>The 2D PSMAs are life-size photographs of the 3D PSMAs. | Behavioral: Portion Size Measurement Aids (PSMAs)<br>* Subjects are randomly assigned to receive either 2D or 3D PSMAs to examine accuracy, acceptability and usefulness of the models. Both groups receive brief instructions on the use of the respective PSMAs, complete an accuracy estimation task, and are given the 2D or 3D PSMAs to take home with them to use for 2-4 weeks, after which the researchers telephone parents to complete a brief satisfaction and usefulness survey.<br>* Other names: 3D Portion Size Measurement Aids (PSMAs);|
| Experimental: 3D Portion Size Measurement Aids (PSMAs)<br>The 3D PSMAs include foam rubber replicas of a golf ball, a hockey puck, a tennis ball and a baseball. | Behavioral: Portion Size Measurement Aids (PSMAs)<br>* Subjects are randomly assigned to receive either 2D or 3D PSMAs to examine accuracy, acceptability and usefulness of the models. Both groups receive brief instructions on the use of the respective PSMAs, complete an accuracy estimation task, and are given the 2D or 3D PSMAs to take home with them to use for 2-4 weeks, after which the researchers telephone parents to complete a brief satisfaction and usefulness survey.<br>* Other names: 3D Portion Size Measurement Aids (PSMAs);|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Accuracy of food portion size estimation | During the initial interview, the subject receives a brief description of the task and is shown pre-estimated rubber food models. The subject then estimates the portion sizes (volumes) of the rubber food models using either 2D or 3D PSMAs. | At the time of subject interview (single time point) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Acceptability (satisfaction and usefulness) of 2D and 3D PSMAs | After the intial interview, subjects are given either 2D or 3D PSMAs to take home with them to use in a real-world setting. After 2-4 weeks, the researcher team contacts the subjects to complete a brief telephone interview to determine parental satisfaction and usefulness regarding the 2D or 3D PSMAs. | 2-4 weeks following the accuracy assessment | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Nutrition, Obesity, Parent, Portion Size Estimation, Accuracy