. Author manuscript; available in PMC: 2009 Nov 1.

Published in final edited form as: Addict Behav. 2008 Mar 4;33(11):1470–1476. doi: 10.1016/j.addbeh.2008.02.015

Table 1.

Individual Variable Contributions in Hierarchical Regression Models Examining Posttraumatic Stress Symptom Levels

	CASI Total Score			Disease Concerns			Unsteady Concerns			Mental Illness Concerns			Social Concerns
	ΔR²	β	sr²	ΔR²	β	sr²	ΔR²	β	sr²	ΔR²	β	sr²	ΔR²	β	sr²
Step 1	.05^*			.05^*			.05^*			.05^*			.05^*
Negative Affectivity		.24^*	.05		.24^*	.05		.24^*	.05		.24^*	.05		.24^*	.05
Step 2	.35^***			.28^***			.21^***			.46^***			.11^*
Negative Affectivity		−.11	.01		−.04	.00		.07	.00		−.01	.00		.17	.03
AS		.59^***	.29		.50^***	.21		.34^**	.12		.65^***	.42		.09	.01
Smoking History		.24^*	.08		.22^*	.06		.31^**	.11		.22^*	.08		.30^*	.09
Step 3	.04^*			.04^*			.02			.00			.00
Negative Affectivity		−.14	.02		−.07	.00		.05	.00		−.02	.00		.17	.03
AS		.43^**	.14		.31^*	.06		.22	.03		.57^***	.23		.06	.06
Smoking History		.22^*	.07		.21^*	.06		.31^**	.11		.21^*	.08		.29^*	.08
AS × Smoking History^a		.27^*	.06		.29^*	.06		.19	.02		.10	.01		.05	.00

Note. n = 64; β = standardized beta weight; AS = anxiety sensitivity.

interaction term for Anxiety Sensitivity Index (Silverman et al., 1991) scores and lifetime smoking status (coded: 0 = never smoked; 1 = positive smoking history).