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| ID | Type | Description | Link |
|---|---|---|---|
| K01HL147713 | U.S. NIH Grant/Contract | View source |
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| Name | Class |
|---|---|
| Wellcome Trust | OTHER |
| University of Edinburgh | OTHER |
| National Heart, Lung, and Blood Institute (NHLBI) | NIH |
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Purpose: To assess the impact of taxes, warnings, and a combination of taxes and warnings on US adults' decisions to purchase products that contain red meat in an online grocery store.
Procedures (methods): Participants will be recruited from Prime Panels (an online panel research company). Following online consent, participants will be assigned to one of four trial arms: 1) Control (no warning and no tax), 2) Warnings (all products that contain red meat have a health warning and environmental warning), 3) Tax (30% tax on products that contain red meat), and 4) Combined warning and tax (all products that contain red meat will have the two warnings and a 30% tax). Then, participant will enter an online grocery store reflecting their assigned arm. The participant will be instructed to complete a shopping task in the online grocery store. After completing the shopping task, participants will be redirected to an online survey and answer a series of questions about the shopping task, labels (excluding tax and control groups), and taxes (excluding warning and control groups). Questions will also include standard demographic and health related variables.
Participants will be recruited from Prime Panels (an online panel research company). Following online consent, participants will be randomly assigned to one of four trial arms affecting the appearance of an online grocery store. Once in the online grocery store, participants will complete a shopping task. The participants will have 9 specified items to add to their shopping cart (1 pizza, 1 burrito, Burger patties [meat or vegetarian], Breakfast sausages [meat or vegetarian], 1 frozen individual meal, 1 loaf of bread, 1 sandwich filling [for example, ham, turkey, or peanut butter], 1 pack of tortillas, 1 taco filling [for example, steak, chicken, or beans]). Participants will be informed that they will not be spending any of their own money to complete the shopping task. After completing the shopping task, participants will be redirected to a survey. They will provide self-reported responses to survey questions (e.g. perceived healthfulness from eating red meat, perceived risk of cancer from eating red meat, thinking about the health/environmental harms of food products). Participants will also answer demographic and health related questions.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Control | Other | Products that contain red meat will not have warning labels or an increase in price. |
|
| Warning Labels | Experimental | The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." |
|
| Tax | Experimental | The tax is a 30% increase in the price of products that contain red meat. |
|
| Combined Warning Labels and Tax | Experimental | The Combined Warning Labels and Tax arm features both the warning labels and tax. The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." The tax is a 30% increase in the price of red meat products. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Control | Other | Participants will complete a shopping task in the online grocery store, and the products that contain red meat will not have warning labels or a 30% increase in price. |
| Measure | Description | Time Frame |
|---|---|---|
| Count of Products That Contain Red Meat | The number of products in a participant's shopping basket that contain red meat. | At completion of ~15 minute shopping task |
| Percentage of Red Meat Containing Products | The percentage of products in a participant's shopping basket that contain red meat. | At completion of ~15 minute shopping task |
| Measure | Description | Time Frame |
|---|---|---|
| Total Saturated Fat | Total grams of saturated fat of products in a participant's shopping basket. This will be calculated by adding together the total saturated fat from each product in the participant's shopping basket. Saturated fat for each product will come from the product's nutrition facts panel. All products in the store are real life products that have designated nutrition facts panels. | At completion of ~15 minute shopping task |
| Measure | Description | Time Frame |
|---|---|---|
| Percentage of Participants Who Support Tax | Support of policy for taxes on red meat products in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Those who indicated '4' or '5' were assumed to more strongly agree to support a red meat product tax. This measure reports the percentage of those with a response of '4' or '5'. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Lindsey S Taillie, PhD | University of North Carolina, Chapel Hill | Principal Investigator |
| Lindsay Jaacks, PhD | University of Edinburgh | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Carolina Population Center | Chapel Hill | North Carolina | 27516 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 38622655 | Derived | Willits-Smith A, Taillie LS, Jaacks LM, Frank SM, Grummon AH. Effects of red meat taxes and warning labels on food groups selected in a randomized controlled trial. Int J Behav Nutr Phys Act. 2024 Apr 15;21(1):39. doi: 10.1186/s12966-024-01584-9. | |
| 37721952 | Derived | Taillie LS, Bercholz M, Prestemon CE, Higgins ICA, Grummon AH, Hall MG, Jaacks LM. Impact of taxes and warning labels on red meat purchases among US consumers: A randomized controlled trial. PLoS Med. 2023 Sep 18;20(9):e1004284. doi: 10.1371/journal.pmed.1004284. eCollection 2023 Sep. |
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A deidentified dataset and the survey codebook will be published to the Harvard Dataverse. The study protocol and statistical analysis plan will be published as supporting information with the study results in a peer-reviewed journal.
The deidentified dataset and corresponding survey codebook will be available upon publication of study results and will remain on the Harvard Dataverse indefinitely.
Anyone who wishes to access the data.
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| ID | Title | Description |
|---|---|---|
| FG000 | Control Arm | Products that contain red meat will not have warning labels or an increase in price. Control: Participants will complete a shopping task in the online grocery store, and the products that contain red meat will not have warning labels or a 30% increase in price. |
| FG001 | Warning Labels Arm | The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." Warning Labels: While completing the shopping task in the online grocery store, the health and environmental warning labels will appear next to the image of every product that contains red meat. |
| FG002 | Tax Arm | The tax is a 30% increase in the price of products that contain red meat. Tax: While completing the shopping task in the online grocery store, all products containing red meat will have a 30% increase in price. |
| FG003 | Combined Warning Labels and Tax Arm | The Combined Warning Labels and Tax arm features both the warning labels and tax. The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." The tax is a 30% increase in the price of red meat products. Combined Warning Labels and Tax: While completing the shopping task in the online grocery store, all products containing red meat will have the health and environmental warning labels appear next to the product image and a 30% increase in price. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
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| ID | Title | Description |
|---|---|---|
| BG000 | Control Arm | Products that contain red meat will not have warning labels or an increase in price. Control: Participants will complete a shopping task in the online grocery store, and the products that contain red meat will not have warning labels or a 30% increase in price. |
| BG001 | Warning Labels Arm |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Continuous | Mean |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Count of Products That Contain Red Meat | The number of products in a participant's shopping basket that contain red meat. | Posted | Mean | Standard Deviation | red meat products | At completion of ~15 minute shopping task |
|
From the time of signing the Informed Consent and completion of the shopping task (~15 minutes) through completion of the post-shopping task computer survey (~15 minutes), an approximate total of up to 30 minutes.
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Control Arm | Products that contain red meat will not have warning labels or an increase in price. Control: Participants will complete a shopping task in the online grocery store, and the products that contain red meat will not have warning labels or a 30% increase in price. |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Lindsey Smith Taillie, PhD | University of North Carolina at Chapel Hill | (919) 445-8313 | taillie@unc.edu |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot | Yes | No | No | Study Protocol | Apr 30, 2021 | Jun 29, 2022 | Prot_004.pdf |
| SAP | No | Yes | No | Statistical Analysis Plan | Jun 1, 2021 | Jun 2, 2021 | SAP_003.pdf |
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| ID | Term |
|---|---|
| D003110 | Colonic Neoplasms |
| D012004 | Rectal Neoplasms |
| ID | Term |
|---|---|
| D015179 | Colorectal Neoplasms |
| D007414 | Intestinal Neoplasms |
| D005770 | Gastrointestinal Neoplasms |
| D004067 | Digestive System Neoplasms |
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| ID | Term |
|---|---|
| D013660 | Taxes |
| ID | Term |
|---|---|
| D004467 | Economics |
| D004472 | Health Care Economics and Organizations |
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| Warning Labels | Other | While completing the shopping task in the online grocery store, the health and environmental warning labels will appear next to the image of every product that contains red meat. |
|
| Tax | Other | While completing the shopping task in the online grocery store, all products containing red meat will have a 30% increase in price. |
|
| Combined Warning Labels and Tax | Other | While completing the shopping task in the online grocery store, all products containing red meat will have the health and environmental warning labels appear next to the product image and a 30% increase in price. |
|
| Total Sodium | Total grams of sodium of products in a participant's shopping basket. This will be calculated by adding together the total sodium from each product in the participant's shopping basket. Sodium for each product will come from the product's nutrition facts panel. All products in the store are real life products that have designated nutrition facts panels. | At completion of ~15 minute shopping task |
| Total Calories | Total calories of products in a participant's shopping basket. This will be calculated by adding together the total calories from each product in the participant's shopping basket. Calories for each product will come from the product's nutrition facts panel. All products in the store are real life products that have designated nutrition facts panels. | At completion of ~15 minute shopping task |
| Perceived Healthfulness | Perceived healthfulness of eating red meat. Likert response options are on a 1 to 5 scale, with higher scores representing a higher perceived healthfulness of eating red meat. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Perceived Cancer Risk | Perceived risk of colon and rectal cancer from eating red meat. Likert response options are on a 1 to 5 scale, with higher scores representing a higher perceived risk of colon and rectal cancer from eating red meat. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Perceived Environmental Risk | Perceived risk of environmental harms from eating red meat. Likert response options are on a 1 to 5 scale, with higher scores representing a higher perceived risk of environmental harms from eating red meat. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Cognitive Elaboration (Health) | Thinking about the health harms of food products while completing the shopping task. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of thinking about health harms of food products. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Cognitive Elaboration (Environment) | Thinking about the environmental harms of food products while completing the shopping task. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of thinking about the environmental harms of food products. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Cognitive Elaboration (Price) | Thinking about the price of food products while completing the shopping task. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of thinking about the price of food products. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Specific Perceived Healthfulness | Perceived healthfulness of specific red meat products (burgers, pepperoni pizza, and deli ham). Likert response options are on a 1 to 5 scale, with lower scores representing worse for health and higher scores representing better for health. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Specific Perceived Environmental Risk | Perceived environmental harm of specific red meat products (burgers, pepperoni pizza, and deli ham). Likert response options are on a 1 to 5 scale, with lower scores representing worse for the environment and higher scores representing better for the environment. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Perceived Cost of the Burger Product. | Perceived cost of the burger product. Likert response options are on a 1 to 5 scale, with lower scores representing less expensive and higher scores representing more expensive. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Perceived Cost of the Pizza Product. | Perceived cost of the pizza product. Likert response options are on a 1 to 5 scale, with lower scores representing less expensive and higher scores representing more expensive. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Perceived Cost of the Ham Product. | Perceived cost of the ham product. Likert response options are on a 1 to 5 scale, with lower scores representing less expensive and higher scores representing more expensive. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Intention to Reduce | Intention to reduce red meat consumption in the next 30 days. Likert response options are on a 1 to 5 scale, with higher scores representing a higher intention to reduce red meat consumption in the next 30 days. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Percentage of Participants Who Support Health Warning Label | Support of policy for health warning labels on red meat products in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Those who indicated '4' or '5' were assumed to more strongly agree to support a health warning label. This measure reports the percentage of those with a response of '4' or '5'. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Percentage of Participants Who Support Environmental Warning Label | Support of policy for environmental warning labels on red meat products in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Support of policy for taxes on environmental warning labels in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Those who indicated '4' or '5' were assumed to more strongly agree to support an environmental warning label. This measure reports the percentage of participants with a response of '4' or '5'. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Mean Modified Waterlander Acceptability Scale Score | Acceptability of the online grocery store. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of agreement. Acceptability of the online grocery store is measured using 3 items adapted from Waterlander et al., 2011. Responses to the 3 items will be averaged to create an acceptability score sum ranging from 3-15 then divided by the total number of questions asked (n = 3). Prompt: Say whether you agree or disagree with the following statements. I could easily find all of the food and beverages I was looking for in the online grocery store. There were enough food and beverage options in the online grocery store. This online grocery store felt like a real online grocery store. Waterlander WE, Scarpa M, Lentz D, Steenhuis IHM. The virtual supermarket: an innovative research tool to study consumer food purchasing behavior. 2011;11:589. DOI: 10.1186/1471-2458-11-589. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
| Ease of Store Use | Ease of use of the online grocery store. Likert response options are on a 1 to 5 scale, with higher scores representing more agreement that the online grocery store is easy to use. | ~15 minutes post-test computer survey following the ~15 minute shopping task |
The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." Warning Labels: While completing the shopping task in the online grocery store, the health and environmental warning labels will appear next to the image of every product that contains red meat. |
| BG002 | Tax Arm | The tax is a 30% increase in the price of products that contain red meat. Tax: While completing the shopping task in the online grocery store, all products containing red meat will have a 30% increase in price. |
| BG003 | Combined Warning Labels and Tax Arm | The Combined Warning Labels and Tax arm features both the warning labels and tax. The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." The tax is a 30% increase in the price of red meat products. Combined Warning Labels and Tax: While completing the shopping task in the online grocery store, all products containing red meat will have the health and environmental warning labels appear next to the product image and a 30% increase in price. |
| BG004 | Total | Total of all reporting groups |
| years |
|
| Sex/Gender, Customized | Count of Participants | Participants |
|
| Race/Ethnicity, Customized | Reporting of race/ethnicity was optional. Race and ethnicity were collected in separate survey questions. All reported data are included. | Count of Participants | Participants |
|
| Region of Enrollment | Count of Participants | Participants |
|
| OG002 | Tax Arm | The tax is a 30% increase in the price of products that contain red meat. Tax: While completing the shopping task in the online grocery store, all products containing red meat will have a 30% increase in price. |
| OG003 | Combined Warning Labels and Tax Arm | The Combined Warning Labels and Tax arm features both the warning labels and tax. The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." The tax is a 30% increase in the price of red meat products. Combined Warning Labels and Tax: While completing the shopping task in the online grocery store, all products containing red meat will have the health and environmental warning labels appear next to the product image and a 30% increase in price. |
|
|
|
| Primary | Percentage of Red Meat Containing Products | The percentage of products in a participant's shopping basket that contain red meat. | Posted | Mean | Standard Deviation | percentage of red meat items | At completion of ~15 minute shopping task |
|
|
|
|
| Secondary | Total Saturated Fat | Total grams of saturated fat of products in a participant's shopping basket. This will be calculated by adding together the total saturated fat from each product in the participant's shopping basket. Saturated fat for each product will come from the product's nutrition facts panel. All products in the store are real life products that have designated nutrition facts panels. | Posted | Mean | Standard Deviation | grams | At completion of ~15 minute shopping task |
|
|
|
|
| Secondary | Total Sodium | Total grams of sodium of products in a participant's shopping basket. This will be calculated by adding together the total sodium from each product in the participant's shopping basket. Sodium for each product will come from the product's nutrition facts panel. All products in the store are real life products that have designated nutrition facts panels. | Posted | Mean | Standard Deviation | grams | At completion of ~15 minute shopping task |
|
|
|
|
| Secondary | Total Calories | Total calories of products in a participant's shopping basket. This will be calculated by adding together the total calories from each product in the participant's shopping basket. Calories for each product will come from the product's nutrition facts panel. All products in the store are real life products that have designated nutrition facts panels. | Posted | Mean | Standard Deviation | kcal | At completion of ~15 minute shopping task |
|
|
|
|
| Secondary | Perceived Healthfulness | Perceived healthfulness of eating red meat. Likert response options are on a 1 to 5 scale, with higher scores representing a higher perceived healthfulness of eating red meat. | Assessed for participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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|
|
| Secondary | Perceived Cancer Risk | Perceived risk of colon and rectal cancer from eating red meat. Likert response options are on a 1 to 5 scale, with higher scores representing a higher perceived risk of colon and rectal cancer from eating red meat. | Assessed for all participants who provided response. | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Secondary | Perceived Environmental Risk | Perceived risk of environmental harms from eating red meat. Likert response options are on a 1 to 5 scale, with higher scores representing a higher perceived risk of environmental harms from eating red meat. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Secondary | Cognitive Elaboration (Health) | Thinking about the health harms of food products while completing the shopping task. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of thinking about health harms of food products. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Secondary | Cognitive Elaboration (Environment) | Thinking about the environmental harms of food products while completing the shopping task. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of thinking about the environmental harms of food products. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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|
|
| Secondary | Cognitive Elaboration (Price) | Thinking about the price of food products while completing the shopping task. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of thinking about the price of food products. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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|
|
| Secondary | Specific Perceived Healthfulness | Perceived healthfulness of specific red meat products (burgers, pepperoni pizza, and deli ham). Likert response options are on a 1 to 5 scale, with lower scores representing worse for health and higher scores representing better for health. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Secondary | Specific Perceived Environmental Risk | Perceived environmental harm of specific red meat products (burgers, pepperoni pizza, and deli ham). Likert response options are on a 1 to 5 scale, with lower scores representing worse for the environment and higher scores representing better for the environment. | Assessed for all participants who provided response. | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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|
|
| Secondary | Perceived Cost of the Burger Product. | Perceived cost of the burger product. Likert response options are on a 1 to 5 scale, with lower scores representing less expensive and higher scores representing more expensive. | Assessed for all participants who provided response. | Posted | Mean | Standard Deviation | score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Secondary | Perceived Cost of the Pizza Product. | Perceived cost of the pizza product. Likert response options are on a 1 to 5 scale, with lower scores representing less expensive and higher scores representing more expensive. | Assessed for all participants who provided response. | Posted | Mean | Standard Deviation | score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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| Secondary | Perceived Cost of the Ham Product. | Perceived cost of the ham product. Likert response options are on a 1 to 5 scale, with lower scores representing less expensive and higher scores representing more expensive. | Assessed for all participants who provided response. | Posted | Mean | Standard Deviation | score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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|
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| Secondary | Intention to Reduce | Intention to reduce red meat consumption in the next 30 days. Likert response options are on a 1 to 5 scale, with higher scores representing a higher intention to reduce red meat consumption in the next 30 days. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Other Pre-specified | Percentage of Participants Who Support Tax | Support of policy for taxes on red meat products in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Those who indicated '4' or '5' were assumed to more strongly agree to support a red meat product tax. This measure reports the percentage of those with a response of '4' or '5'. | Assessed for all participants who provided response | Posted | Number | percentage of participants | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Other Pre-specified | Percentage of Participants Who Support Health Warning Label | Support of policy for health warning labels on red meat products in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Those who indicated '4' or '5' were assumed to more strongly agree to support a health warning label. This measure reports the percentage of those with a response of '4' or '5'. | Assessed for all participants who provided response | Posted | Number | percentage of participants | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
|
| Other Pre-specified | Percentage of Participants Who Support Environmental Warning Label | Support of policy for environmental warning labels on red meat products in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Support of policy for taxes on environmental warning labels in the U.S. Likert response options are on a 1 to 5 scale, with higher scores representing a greater deal of support. Those who indicated '4' or '5' were assumed to more strongly agree to support an environmental warning label. This measure reports the percentage of participants with a response of '4' or '5'. | Assessed for all participants who provided response | Posted | Number | percentage of participants | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
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|
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| Other Pre-specified | Mean Modified Waterlander Acceptability Scale Score | Acceptability of the online grocery store. Likert response options are on a 1 to 5 scale, with higher scores representing a higher amount of agreement. Acceptability of the online grocery store is measured using 3 items adapted from Waterlander et al., 2011. Responses to the 3 items will be averaged to create an acceptability score sum ranging from 3-15 then divided by the total number of questions asked (n = 3). Prompt: Say whether you agree or disagree with the following statements. I could easily find all of the food and beverages I was looking for in the online grocery store. There were enough food and beverage options in the online grocery store. This online grocery store felt like a real online grocery store. Waterlander WE, Scarpa M, Lentz D, Steenhuis IHM. The virtual supermarket: an innovative research tool to study consumer food purchasing behavior. 2011;11:589. DOI: 10.1186/1471-2458-11-589. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
| Other Pre-specified | Ease of Store Use | Ease of use of the online grocery store. Likert response options are on a 1 to 5 scale, with higher scores representing more agreement that the online grocery store is easy to use. | Assessed for all participants who provided response | Posted | Mean | Standard Deviation | Score on a scale | ~15 minutes post-test computer survey following the ~15 minute shopping task |
|
|
|
| 0 |
| 887 |
| 0 |
| 887 |
| 0 |
| 887 |
| EG001 | Warning Labels Arm | The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." Warning Labels: While completing the shopping task in the online grocery store, the health and environmental warning labels will appear next to the image of every product that contains red meat. | 0 | 891 | 0 | 891 | 0 | 891 |
| EG002 | Tax Arm | The tax is a 30% increase in the price of products that contain red meat. Tax: While completing the shopping task in the online grocery store, all products containing red meat will have a 30% increase in price. | 0 | 874 | 0 | 874 | 0 | 874 |
| EG003 | Combined Warning Labels and Tax Arm | The Combined Warning Labels and Tax arm features both the warning labels and tax. The warning labels are black octagons with white text that appear next to images of products that contain red meat. One label says "WARNING: Eating red meat contributes to colon and rectal cancer" and the other label says "WARNING: Eating red meat harms the environment." The tax is a 30% increase in the price of red meat products. Combined Warning Labels and Tax: While completing the shopping task in the online grocery store, all products containing red meat will have the health and environmental warning labels appear next to the product image and a 30% increase in price. | 0 | 866 | 0 | 866 | 0 | 866 |
Not provided
Not provided
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| D009371 | Neoplasms by Site |
| D009369 | Neoplasms |
| D004066 | Digestive System Diseases |
| D005767 | Gastrointestinal Diseases |
| D003108 | Colonic Diseases |
| D007410 | Intestinal Diseases |
| D012002 | Rectal Diseases |
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The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.001 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | 0.022 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.001 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.001 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
The a priori threshold for statistical significance is <0.05. |
| Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | >0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |
| Regression, Linear | <0.05 | The a priori threshold for statistical significance is <0.05. | Superiority |