Appendix Table B.

Insomnia Severity Index Subscale Scores on IDQ-S Subscales

	IDQ-Sc –Lack of Cognitive Coping			IDQ-Sc –Withdrawal Intolerance
Variable	β	t	p	β	t	p
Gender	−.013	−.191	.849	−.153	−2.473	.014
Age	.006	.093	.926	−.128	−2.095	.037
Race	−.033	−.486	.628	−.066	−1.074	.284
HSIa	.146	2.091	.038	.186	2.936	.004
DIIb	−.058	−.835	.404	.101	1.597	.112
ISI Severity subscale	−.102	−1.487	.138	.269	4.301	< .001
R2		.029			.198
ΔR2		.010			.068
F for ΔR2		2.211			18.501**
Gender	−.002	−.031	.975	−.172	−2.898	.004
Age	.004	.062	.951	−.098	−1.642	.102
Race	−.029	−.430	.668	−.084	−1.413	.159
HSIa	.136	1.921	.056	.156	2.514	.013
DIIb	−.062	−.878	.381	.073	1.188	.236
ISI Impact subscale	−.036	−.512	.609	.362	5.855	< .001
R 2		.020			.249
ΔR2		.001			.119
F for ΔR2		.262			34.284**

Note: N = 224. Results shown are from the second step of each linear regression model; β = standardized beta weights; Race: Reference group = white; Gender: Reference group = female

^aHeaviness of Smoking Index

^bDistress Intolerance Index

^cIntolerance for Smoking Abstinence Discomfort Questionnaire

^*p < .05

^**p < .01