Table 2. Multivariate Regression Models Examining Literacy, Numeracy, Plan Comparison Approach, and Interactions Between Skill Level and Chart Approach.

	Regression Coefficients
	Identifying Subindex	Synthesizing Subindex
Literacy
Lower	—	—
Higher	1.3**	0.3*
Subjective Numeracy
Lower	—	—
Higher	0.6*	0.2
Plan Comparison Chart
Original	—	—
Revised	-0.4	-0.1
Interactions
Revised Chart * Higher Literacy	1.0†	—
Revised Chart * Higher Numeracy	—	0.7*
Adjusted R2	0.28	0.14

^†<0.10.

^*p<0.05.

^**p<0.01.

^***p<0.001.

NOTES: Interaction terms were included if they improved the model's R² over the base model at the p<0.10 level.

SOURCE: Greene, J., University of Oregon and Peters, E., Decision Research, 2009.