. Author manuscript; available in PMC: 2010 Jan 1.

Published in final edited form as: Subst Use Misuse. 2009;44(14):2128–2140. doi: 10.3109/10826080902864571

Table 2.

Multivariate Models: Adding Blocks of Independent Variables Sequentially

Model^a	Pseudo-R²	F^b	p

Demographics	.0580	--	--
Demographics + Smoking history	.1560	15.73	<.0001
Demographics + Smoking history + Addiction	.6417	90.48	<.0001
Demographics + Smoking history + Addiction + Smoking exposure	.6588	13.33	<.0001
Final model: Demographics + Smoking history + Addiction + Smoking exposure + Smoking in social situations	.7025	4.73	<.0001

Demographics block does not include urban/rural variable; Addiction block does not include “number times tried to quit” variable’”; Smoking exposure block does not include “number in household who smoke”

F compares model with the model one row above