- Title
- Choice Consistency in Discrete Choice Experiments: Does Numeracy Skill Matter?
- Creator
- Genie, Mesfin G.; Poudel, Nabin; Paolucci, Francesco; Ngorsuraches, Surachat
- Relation
- Value in Health Vol. 27, Issue 11, p. 1594-1604
- Publisher Link
- http://dx.doi.org/10.1016/j.jval.2024.07.001
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2024
- Description
- Objectives: This study investigated the relationship between numeracy skills (NS) and choice consistency in discrete choice experiments (DCEs). Methods: A DCE was conducted to explore patients’ preferences for kidney transplantation in Italy. Patients completed the DCE and answered 3-item numeracy questions. A heteroskedastic multinomial logit model was used to investigate the effect of numeracy on choice consistency. Results: Higher NS were associated with greater choice consistency, increasing the scale to 1.63 (P < .001), 1.39 (P < .001), and 1.18 (P < .001) for patients answering 3 of 3, 2 of 3, and 1 of 3 questions correctly, respectively, compared with those with no correct answers. This corresponded to 63%, 39%, and 18% more consistent choices, respectively. Accounting for choice consistency resulted in varying willingness-to-wait (WTW) estimates for kidney transplant attributes. Patients with the lowest numeracy (0/3) were willing to wait approximately 42 months [95% CI: 29.37, 54.68] for standard infectious risk, compared with 33 months [95% CI: 28.48, 38.09] for 1 of 3, 28 months [95% CI: 25.13, 30.32] for 2 of 3, and 24 months [95% CI: 20.51, 27.25] for 3 of 3 correct answers. However, WTW differences for an additional year of graft survival and neoplastic risk were not statistically significant across numeracy levels. Supplementary analyses of 2 additional DCEs on COVID-19 vaccinations and rheumatoid arthritis, conducted online, supported these findings: higher NS were associated with more consistent choices across different disease contexts and survey formats. Conclusions: The findings suggested that combining patients with varying NS could bias WTW estimates, highlighting the need to consider numeracy in DCE data analysis and interpretation.
- Subject
- choice consistency; discrete choice experiments; numeracy skill; willingness-to-wait
- Identifier
- http://hdl.handle.net/1959.13/1517742
- Identifier
- uon:57173
- Identifier
- ISSN:1098-3015
- Rights
- x
- Language
- eng
- Reviewed
- Hits: 3
- Visitors: 3
- Downloads: 0