Figure 1

Difference (after viewing the decision aid minus before viewing it, in Likert-scale units) in “How likely are you to get genetic testing for Alzheimer’s disease in the next year?” For this question, the Likert-scale units were −2 = “Not at all likely,” −1 = “Somewhat unlikely,” 0 = “Haven’t really formed an opinion yet,” +1 = “Somewhat likely,” and +2 = “Very likely.” Thus, a difference of +4 Likert units is an increase in perceived likelihood from −2 = “Not at all likely” before viewing the decision aid to +2 = “Very likely” after viewing it. A difference of +3 means an increase from −2 to +1 or from −1 to +2. A negative difference (i.e., a change of −1,−2, −3, or −4) indicates a decrease in likelihood. Shown are the results for the 95% of respondents who did not previously undergo APOE testing (n = 1,174).