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Maximising responses to discrete choice experiments: a randomised trial.

Joanna Coast1, Terry N Flynn, Chris Salisbury

  • 1Health Economics Facility, Health Services Management Centre, University of Birmingham, Birmingham, UK. j.coast@bham.ac.uk

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Summary

This study found that longer questionnaires in healthcare settings yield similar response rates to shorter ones. The choice between questionnaire length involves balancing response rates with the depth of information gathered.

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Area of Science:

  • Health Services Research
  • Survey Methodology

Background:

  • Determining optimal questionnaire design is crucial for maximizing data collection efficiency and respondent engagement.
  • A trade-off often exists between questionnaire length, response rates, and the richness of information obtained.

Purpose of the Study:

  • To compare response and completion rates between short and long questionnaire versions.
  • To assess the impact of questionnaire length on the level of information gathered from respondents.
  • To evaluate the trade-off between response rate and data completeness in survey research.

Main Methods:

  • A randomized trial was conducted comparing two questionnaire versions: a short version for main effects and a long version for two-way interactions.
  • Best-worst scaling, a discrete choice experimentation method, was employed.
  • Data were collected via post, with analysis focusing on response rates, completion rates, and mean utility differences.

Main Results:

  • The overall participation rate was 53%.
  • Response rates for the long questionnaire (83.2%) and short questionnaire (85.1%) were similar, with a non-significant difference of 1.9%.
  • Both questionnaire versions yielded comparable inferences regarding respondent choices.

Conclusions:

  • In healthcare settings, using a longer questionnaire (16 scenarios) with best-worst scaling did not significantly reduce response rates compared to a shorter version (8 scenarios).
  • The findings suggest that longer, more detailed questionnaires can be utilized without substantially compromising response rates for this type of study design.