Alcohol consumption Not Applicable
Conditions
Interventions
General population households will be exposed to two interventions comprising i) two different bottles sizes (within-subjects factor), randomized in their order of presentation and separated by a ‘usu
Sponsors
University of Cambridge
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: Eligible households are those in which adult members meet the following criteria: 1. Self-report that they collectively drink at least 2 x 75 cl bottles of wine (1.5 litres) a week 2. Usually purchase wine online or are willing to purchase wine online 3. Are willing to consume wine(s) exclusively from the study wine list and order a total of approximately 6 weeks’ worth of wine 4. Be prepared to drink all study wine (including both red and white) from the study wine glasses 5. Are in possession of a smartphone or similar device from which to send photographs of wine bottles and wine glasses 6. Do not take medications for which there is a recommendation against alcohol consumption 7. Are not pregnant or are planning on becoming pregnant during the study period 8. Do not have a history of becoming ill after alcohol consumption 9. Do not have a history of alcoholism or a serious mental illness (including paranoid and other psychotic disorders, bipolar disorders and schizoaffective disorders)
Exclusion criteria
Exclusion criteria: Households with adult household members with the following characteristics will be excluded: 1. Self-report drinking less than 2 x 75cl bottles a week, at the household level 2. Take medications for which there is a recommendation against alcohol consumption 3. Have a history of becoming ill after alcohol consumption, requiring hospitalisation 4. Have a history of alcoholism or a serious mental illness (including paranoid and other psychotic disorders, bipolar disorders and schizoaffective disorders) 5. Are pregnant or plan on becoming pregnant during the study period
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Current primary outcome measure as of 08/02/2021: Volume of study wine consumed (in millilitres) during each intervention period for each bottle-glass size combination, estimated through returned photographs of all study wine bottles purchased. Volumes consumed from opened bottles will be estimated from photographs of the bottles placed on study scales with their weights in grams visible (See the Procedure section for more details). Estimates will be based on the following procedures : 1. Estimating the weight of unopened bottles. This will be done by taking the median value of all estimates deriving from: 1.1. The weight of three of each bottle – unopened - on the study wine list (i.e. 66 bottles: 33 x 75cl and 33 x 37.5cl bottles) as measured unopened by an employee of the supplying wine merchant 1.2. The weight of unopened bottles as shown in submitted photographs by all participants 2. The average weight of 1ml of wine (0.994 grams ) will be used to calculate the weight of empty bottles, i.e. by subtracting the weight of the liquid from the weight of the unopened bottle 3. The estimated weight of the empty bottle (measured without a top) will be subtracted from the weight of the partially full bottle (measured without a top) as observed in submitted photographs, to give an estimate of the weight of the consumed wine 4. The validity of the assumptions informing steps 1-3 above will be checked using four selected wines (two with highest and two with the lowest % ABV) in each of 75cl and 37.5cl bottle sizes, weighing both unopened (measured with a top) and empty bottles (measured without a top) Primary analysis Regression analysis will be used to predict wine consumption (in ml) at 14 days from each bottle size with each glass size. Analyses will control for the following covariates: 1. In | — |
Secondary
| Measure | Time frame |
|---|---|
| The mean number of days taken to consume each 1.5 litres of wine during each intervention period with each bottle-glass size combination, estimated from the start and finish dates reported on submitted photographs. Secondary analysis Regression analysis will be used to predict the time taken (in days) to consume each unit of 1.5 litres of wine from each bottle size with each glass size. Analyses will control for all specified covariates. Measurements will be conducted on Day 7 and Day 14 of the first intervention period (i.e. 1 week and 2 weeks after the beginning of the study), as well as on Day 7 and Day 14 of the second intervention period (i.e. 3 weeks and 4 weeks after the beginning of the study; or 4 weeks and 5 weeks after the beginning of the study; or 5 weeks and 6 weeks after the beginning of the study or 6 weeks and 7 weeks after the beginning of the study, depending on the duration of the ‘usual behaviour’ period which will last a maximum of 3 weeks). | — |
Countries
England, United Kingdom
Outcome results
None listed