Table 4

Logistic regression model results†

		Final model
−2logL	3441.4	3423.0	3416.6
Difference	244.7	18.4	6.4
p Value‡	<0.0001	0.0004	0.09

	β Coefficients	β Coefficients	β Coefficients
† −2*log likelihood, β coefficients and their standard errors. Assessing the effects of experiments and respondent characteristics on current smoking status (n=3996).
‡p Values are for forward selection for comparing the logistic regression models.
*The p value for the β coefficient is <0.05.
**The p value for the β coefficient is <0.01.
Intercept	−0.12 (0.16)	−0.32 (0.18)	−0.31 (0.18)
Introduction	0.11 (0.12)	0.54 (0.16)**	0.49 (0.18)**
Filter	−0.08 (0.12)	0.02 (0.17)	−0.04 (0.19)
Intro*Filter	−0.26 (0.17)	−0.58 (0.24)*	−0.38 (0.25)
High school	−0.37 (0.14)**	−0.37 (0.14)**	−0.38 (0.14)**
Some college	−0.61 (0.14)**	−0.63 (0.14)**	−0.63 (0.14)**
College graduate	−1.56 (0.16)**	−1.56 (0.16)**	−1.56 (0.16)**
Female	−0.44 (0.09)**	0.03 (0.17)	−0.03 (0.17)
Hispanic	−0.54 (0.13)**	−0.52 (0.13)**	−0.55 (0.23)**
Spanish	−0.78 (0.21)**	−0.84 (0.21)**	−0.85 (0.21)**
$20000 to $50000	−0.32 (0.11)**	−0.32 (0.11)**	−0.32 (0.11)**
$50000 and up	−0.72 (0.14)**	−0.73 (0.14)**	−0.73 (0.14)**
Income not given	−0.72 (0.18)**	−0.71 (0.18)**	−0.72 (0.18)**
Intro*female		−0.98 (0.24)**	−0.97 (0.24)**
Filter*female		−0.19 (0.24)	−0.18 (0.24)
Introfilterfemale		0.72 (0.35)*	0.70 (0.35)*
Intro*Hispanic			0.22 (0.29)
Filter*Hispanic			0.25 (0.30)
IntrofilterHispanic			−0.95 (0.44)*