Table 2.

Presence of Drinking and Anxiety Measures Predicting ISI.

	Anxiety/Worry Measures
	PSWQ-A			GADSS			STAI-T			SIGH-A
	F†	β‡	p	F†	β‡	p	F†	β‡	p	F†	β‡	p
Step 1: Covariates and Main Effects
Years of Education	0.32	−0.04	0.57	0.08	−0.02	0.78	0.01	0.00	0.94	0.01	0.01	0.91
Gender (0 = male, 1 = female)	0.18	−0.03	0.67	0.14	0.02	0.71	0.00	0.00	0.97	0.08	0.02	0.78
Drink (yes/no)	1.78	−0.09	0.18	1.07	−0.06	0.30	0.86	−0.06	0.35	0.97	−0.06	0.33
Anxiety/Worry measure	39.64	0.39	<0.0001	73.72	0.51	<0.0001	66.76	0.49	<0.0001	81.17	0.53	<0.0001
Step 2: Interaction
Drink* Anxiety/Worry measure	3.98	−0.42	0.04	5.96	−0.41	0.015	7.00	−0.75	0.009	7.85	−0.38	0.006
Full Model R2		0.19			0.29			0.28			0.32

^†Step 1 covariates and main effects: df_numerator= 1, df_denominator= 217; Step 2 interaction: df_numerator= 1, df_denominator= 216.

^‡Standardized beta weight

ISI = Insomnia Severity Index; PSWQ-A = Penn State Worry Questionnaire-Abbreviated; GADSS = Generalized Anxiety Disorder Severity Scale; STAI-T = Trait subscale of the State-Trait Anxiety Inventory; SIGH-A = Structured Interview Guidelines for the Hamilton Anxiety Rating Scale