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Table 1 Attributes, definitions, levels used in the discrete choice experiment and aggregate results of discrete choice experiment

From: Do people have differing motivations for participating in a stated-preference study? Results from a latent-class analysis

Attribute Definition Levels Odds Ratioa 95% CI References
Validity A study is valid if the preferences it measures are the same as the preferences that people have in the real world Low 2.4 (2.2, 2.6) [4, 26]
Med
High
Relevance A study needs to measure preferences that are relevant to patients and the disease it studies Low 1.8 (1.7, 1.9) [26, 27]
Med
High
Bias A study should not try to influence people’s responses by pushing people to answer in a specific way. A biased study might not measure actual preferences Low 1.7 (1.6, 1.8) [26]
Med
High
Burden A study can be easy or difficult to complete. This is related to the number of questions and the number and types of characteristics people have to think about Low 1.2 (1.1, 1.3) [26, 27]
Med
High
Time How long it takes to complete a preference study 15 min 1.1 (1.1, 1.2) [27]
30 min
45 min
Payment How much people get paid to complete a preference study in USD $0 1.4 (1.3, 1.6) [27]
$25
$50
  1. CI confidence interval; min minutes; med medium
  2. aOdds ratio is for a one-level change in attribute
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