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Revista de Salud Pública

Print version ISSN 0124-0064

Abstract

GARCIA-MOLINA, Mario  and  CHICAIZA-BECERRA, Liliana A.. Anchoring bias in face-to-face Time-Trade-Off valuations of health states. Rev. salud pública [online]. 2017, vol.19, n.5, pp.686-690. ISSN 0124-0064.  http://dx.doi.org/10.15446/rsap.v19n5.60924.

Objective

To test whether anchoring (a cognitive bias) occurs during face-to-face interviews to value health states by Time-Trade-Off.

Methods

147 Colombian subjects (111 males, 36 females) valued five EQ-5D health states better than death during a face-to-face interview. Subjects were randomly assigned to two different starting points.

Results

Shapiro-Wilk test discarded normality, while non-parametric tests, including Kolmogorov-Smirnov and Wilcoxon-Mann-Whitney, showed that anchoring was significant in four out of five health states. A higher starting point increased the elicited value by 15 %-188 %. The size of the anchoring effect was not uniform among health states.

Conclusion

Anchoring effects may bias face-to-face Time Trade-Off valuations. The size of the anchoring effect is relevant enough for health policy.

Keywords : Heuristics; cost-benefit analysis; outcome assessment (health care); observer variation; bias; methods (source: MeSH, NLM).

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