Report

Gambling participation and the prevalence of problem gambling survey: Experimental statistics stage

Gambling Commission report produced by NatCen on the experimental statistics stage of the gambling participation and the prevalence of problem gambling survey.

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Published
19 April 2023

Last updated
18 April 2023 - Changes

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Contents

• Gambling participation and the prevalence of problem gambling survey: Experimental statistics stage

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• Executive summary
• - Experimentation work
• - Response
• - Assessment of experiment results
• - Recommendations
• Introduction
• - Background
• - Aims and overview
• Methodology and response
• - Survey design
• - Questionnaire content and design
• - Response to the survey
• Testing an alternative approach to the selection of participants within households
• - Introduction
• - Completion rates in responding households
• - Adherence to participant-selection instructions
• - Duplicate cases
• - Household clustering
• - Prevalence of gambling behaviours
• - Conclusion
• Measuring gambling-related harms
• - Introduction
• - Testing different ways of asking about gambling harms
• - Results
• - Conclusion
• Testing different approaches to asking questions about gambling participation
• - Introduction
• - Comparison of gambling participation across the three approaches
• - Potential primacy effect with the long-list approach
• - Additional considerations for the postal questionnaire
• - Other considerations
• - Conclusion

Duplicate cases

On occasion, a household member completed the survey more than once, either by the same or a different mode. These cases are called duplicates. Potential duplicates were manually reviewed to determine whether responses to multiple questionnaires were very likely to be from the same individual in a household (based on exact matches for the age, sex and name provided).

Each responding adult, up to the maximum number permitted for the experimental condition, was given a £10 pounds incentive. Arguably this incentivises participants to make up household members and/or questionnaires to gain an additional incentive.

In total 78 duplications (1.5 percent of total completions) were identified. Duplications accounted for 1.4 percent of C1 (up to two adults) completions and 1.7 per cent of C2 (up to four adults) completions but the difference was not statistically significant. Even with the increased opportunity for C2 households to complete more interviews and claim an additional incentive, this did not seem to be the case (Table not shown).

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Adherence to participant-selection instructions Next section
Household clustering

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Last updated: 18 April 2023

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