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. 2012 Mar-Apr;32(2):232-6.
doi: 10.1177/0272989X11404077. Epub 2011 Apr 26.

Measuring risk perceptions: what does the excessive use of 50% mean?

Wändi Bruine de Bruin  1 , Katherine G Carman  2
Affiliations

Measuring risk perceptions: what does the excessive use of 50% mean?

Wändi Bruine de Bruin et al. Med Decis Making. 2012 Mar-Apr.

Abstract

Objectives: Risk perceptions are central to good health decisions. People can judge valid probabilities but use 50% disproportionately. The authors hypothesized that 50% is more likely than other responses to reflect not knowing the probability, especially among individuals with low education and numeracy, and evaluated the usefulness of eliciting "don't know" explanations.

Methods: Respondents (n = 1020) judged probabilities for living or dying in the next 10 years, indicating whether they gave a good estimate or did not know the chances. They completed demographics, medical history, and numeracy questions.

Results: Overall, 50% was more likely than other probabilities to be explained as "don't know" (v. "a good estimate"). Correlations of using 50% with low education and numeracy were mediated by expressing "don't know." Judged probabilities for survival and mortality explained as "don't know" had lower correlations with age, diseases, and specialist visits.

Conclusions: When judging risks, 50% may reflect not knowing the probability, especially among individuals with low numeracy and education. Probabilities expressed as "don't know" are less valid. Eliciting uncertainty could benefit theoretical models and educational efforts.

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Figures

Figure 1
Figure 1
Response distributions for judged probabilities of (A) living in the next 10 years and (B) dying in the next 10 years.
See this image and copyright information in PMC

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