How psychological distance of a study sample in discrete choice experiments affects preference measurement: A colorectal cancer screening case study

Jorien Veldwijk*, Catharina G.M. Groothuis-Oudshoorn, Ulrik Kihlbom, Sophie Langenskiöld, Evelien Dekker, Frank G.J. Kallenberg, G. Ardine De Wit, Mattijs S. Lambooij

*Corresponding author for this work

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Abstract

Purpose: The purpose of this study was to investigate to what extent the outcomes of a discrete choice experiment (DCE) differ based on respondents’ psychological distance to the decision at hand.

Methods: A DCE questionnaire regarding individuals’ preferences for genetic screening for colorectal cancer (CRC) within the Dutch national CRC screening program was created. The DCE contained nine D-efficient designed choice tasks and was distributed among two populations that differ in their psychological distance to the decision at hand: 1) a representative sample of the Dutch general population aged 55-65 years, and 2) a sample of Dutch individuals who attended an information appointment regarding colonoscopies following the detection of blood in their stool sample in the CRC screening program. The DCE consisted of four attributes related to the decision whether to participate in genetic screening for CRC: 1) risk of being genetically predisposed, 2) risk of developing CRC, 3) frequency of follow-up colonoscopies, and 4) survival. Direct attribute ranking, dominant decision-making behavior, and relative importance scores (based on panel MIXL) were compared between the two populations. Attribute level estimates were compared with the Swait and Louviere test.

Results: The proportion of respondents who both ranked survival as the most important attribute, and showed dominant decision-making behavior for this attribute, was significantly higher in the screened population compared to the general population. The relative importance scores of the attributes significantly differed between populations. Finally, the Swait and Louviere test also revealed significant differences in attribute level estimates in both the populations.

Conclusion: The study outcomes differed between populations depending on their psychological distance to the decision. This study shows the importance of adequate sample selection; therefore, it is advocated to increase attention to study sample selection and reporting in DCE studies.

Original languageEnglish
Pages (from-to)273-282
Number of pages10
JournalPatient Preference and Adherence
Volume13
DOIs
Publication statusPublished - 2019

Fingerprint

Early Detection of Cancer
Colorectal Neoplasms
cancer
Psychology
experiment
Population
decision making behavior
Genetic Testing
Colonoscopy
Decision Making
Hand
ranking
Appointments and Schedules
Outcome Assessment (Health Care)
questionnaire
Surveys and Questionnaires

Keywords

  • Discrete choice experiment
  • Genetic screening
  • Preferences
  • Psychological distance
  • Sample
  • Stated preferences

Cite this

Veldwijk, Jorien ; Groothuis-Oudshoorn, Catharina G.M. ; Kihlbom, Ulrik ; Langenskiöld, Sophie ; Dekker, Evelien ; Kallenberg, Frank G.J. ; De Wit, G. Ardine ; Lambooij, Mattijs S. / How psychological distance of a study sample in discrete choice experiments affects preference measurement : A colorectal cancer screening case study. In: Patient Preference and Adherence. 2019 ; Vol. 13. pp. 273-282.
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abstract = "Purpose: The purpose of this study was to investigate to what extent the outcomes of a discrete choice experiment (DCE) differ based on respondents’ psychological distance to the decision at hand.Methods: A DCE questionnaire regarding individuals’ preferences for genetic screening for colorectal cancer (CRC) within the Dutch national CRC screening program was created. The DCE contained nine D-efficient designed choice tasks and was distributed among two populations that differ in their psychological distance to the decision at hand: 1) a representative sample of the Dutch general population aged 55-65 years, and 2) a sample of Dutch individuals who attended an information appointment regarding colonoscopies following the detection of blood in their stool sample in the CRC screening program. The DCE consisted of four attributes related to the decision whether to participate in genetic screening for CRC: 1) risk of being genetically predisposed, 2) risk of developing CRC, 3) frequency of follow-up colonoscopies, and 4) survival. Direct attribute ranking, dominant decision-making behavior, and relative importance scores (based on panel MIXL) were compared between the two populations. Attribute level estimates were compared with the Swait and Louviere test.Results: The proportion of respondents who both ranked survival as the most important attribute, and showed dominant decision-making behavior for this attribute, was significantly higher in the screened population compared to the general population. The relative importance scores of the attributes significantly differed between populations. Finally, the Swait and Louviere test also revealed significant differences in attribute level estimates in both the populations.Conclusion: The study outcomes differed between populations depending on their psychological distance to the decision. This study shows the importance of adequate sample selection; therefore, it is advocated to increase attention to study sample selection and reporting in DCE studies.",
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How psychological distance of a study sample in discrete choice experiments affects preference measurement : A colorectal cancer screening case study. / Veldwijk, Jorien; Groothuis-Oudshoorn, Catharina G.M.; Kihlbom, Ulrik; Langenskiöld, Sophie; Dekker, Evelien; Kallenberg, Frank G.J.; De Wit, G. Ardine; Lambooij, Mattijs S.

In: Patient Preference and Adherence, Vol. 13, 2019, p. 273-282.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - How psychological distance of a study sample in discrete choice experiments affects preference measurement

T2 - A colorectal cancer screening case study

AU - Veldwijk, Jorien

AU - Groothuis-Oudshoorn, Catharina G.M.

AU - Kihlbom, Ulrik

AU - Langenskiöld, Sophie

AU - Dekker, Evelien

AU - Kallenberg, Frank G.J.

AU - De Wit, G. Ardine

AU - Lambooij, Mattijs S.

PY - 2019

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N2 - Purpose: The purpose of this study was to investigate to what extent the outcomes of a discrete choice experiment (DCE) differ based on respondents’ psychological distance to the decision at hand.Methods: A DCE questionnaire regarding individuals’ preferences for genetic screening for colorectal cancer (CRC) within the Dutch national CRC screening program was created. The DCE contained nine D-efficient designed choice tasks and was distributed among two populations that differ in their psychological distance to the decision at hand: 1) a representative sample of the Dutch general population aged 55-65 years, and 2) a sample of Dutch individuals who attended an information appointment regarding colonoscopies following the detection of blood in their stool sample in the CRC screening program. The DCE consisted of four attributes related to the decision whether to participate in genetic screening for CRC: 1) risk of being genetically predisposed, 2) risk of developing CRC, 3) frequency of follow-up colonoscopies, and 4) survival. Direct attribute ranking, dominant decision-making behavior, and relative importance scores (based on panel MIXL) were compared between the two populations. Attribute level estimates were compared with the Swait and Louviere test.Results: The proportion of respondents who both ranked survival as the most important attribute, and showed dominant decision-making behavior for this attribute, was significantly higher in the screened population compared to the general population. The relative importance scores of the attributes significantly differed between populations. Finally, the Swait and Louviere test also revealed significant differences in attribute level estimates in both the populations.Conclusion: The study outcomes differed between populations depending on their psychological distance to the decision. This study shows the importance of adequate sample selection; therefore, it is advocated to increase attention to study sample selection and reporting in DCE studies.

AB - Purpose: The purpose of this study was to investigate to what extent the outcomes of a discrete choice experiment (DCE) differ based on respondents’ psychological distance to the decision at hand.Methods: A DCE questionnaire regarding individuals’ preferences for genetic screening for colorectal cancer (CRC) within the Dutch national CRC screening program was created. The DCE contained nine D-efficient designed choice tasks and was distributed among two populations that differ in their psychological distance to the decision at hand: 1) a representative sample of the Dutch general population aged 55-65 years, and 2) a sample of Dutch individuals who attended an information appointment regarding colonoscopies following the detection of blood in their stool sample in the CRC screening program. The DCE consisted of four attributes related to the decision whether to participate in genetic screening for CRC: 1) risk of being genetically predisposed, 2) risk of developing CRC, 3) frequency of follow-up colonoscopies, and 4) survival. Direct attribute ranking, dominant decision-making behavior, and relative importance scores (based on panel MIXL) were compared between the two populations. Attribute level estimates were compared with the Swait and Louviere test.Results: The proportion of respondents who both ranked survival as the most important attribute, and showed dominant decision-making behavior for this attribute, was significantly higher in the screened population compared to the general population. The relative importance scores of the attributes significantly differed between populations. Finally, the Swait and Louviere test also revealed significant differences in attribute level estimates in both the populations.Conclusion: The study outcomes differed between populations depending on their psychological distance to the decision. This study shows the importance of adequate sample selection; therefore, it is advocated to increase attention to study sample selection and reporting in DCE studies.

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