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Record all measures that the respondent consumed
Small cans = 330ml
Large cans = 440ml
Schooner = two thirds of a pint
Bottles and cans of ready mixed shandy are excluded due to their low alcohol content
Sampling
Multi-stage stratified random sample
Study Type
Repeated cross-sectional study;monthly (up to year 2000), eight cycles per year (up to April 2005), monthly thereafter. From April 2014, reverted back to eight cycles per year.