TABLE 3—

Fractional Factorial Design for the Guide to Decide Project

Group	Factor A: Information Display	Factor B: Presentation of Statistics	Factor C: Risk Presentation	Factor D: Order of Presentation	Factor E: Health Risk Context
1	Pictograph	100	Incremental	Benefits first	Present
2	Pictograph	100	Incremental	Risks first	Absent
3	Pictograph	100	Total	Benefits first	Absent
4	Pictograph	100	Total	Risks first	Present
5	Pictograph	1000	Incremental	Benefits first	Absent
6	Pictograph	1000	Incremental	Risks first	Present
7	Pictograph	1000	Total	Benefits first	Present
8	Pictograph	1000	Total	Risks first	Absent
9	Prose only	100	Incremental	Benefits first	Absent
10	Prose only	100	Incremental	Risks first	Present
11	Prose only	100	Total	Benefits first	Present
12	Prose only	100	Total	Risks first	Absent
13	Prose only	1000	Incremental	Benefits first	Present
14	Prose only	1000	Incremental	Risks first	Absent
15	Prose only	1000	Total	Benefits first	Absent
16	Prose only	1000	Total	Risks first	Present

Note. The 4 columns for factors A–D correspond to those in Table 1 ▶ (see Table 1 ▶ for fractional factorial design used here). The final column (factor E; information on other risk factors provided or not provided) corresponds to the ABCD column in Table 1 ▶. This fractional factorial design aliases the main effect of E with the ABCD interaction.