Table 2.

Linear Regression Analysis, Stepwise Method Showing Factors Independently Predicting the Mean Daytime Epworth Sleepiness Scale Score^a

Variable	β	t	P
Analysis 1 with PTSD Checklist
Constant	NA	1.64	.11
Daytime dysfunction	.595	3.55	.002
Sleep medication use	–.216	−1.22	.24
PTSD Checklist	.092	0.43	.67
Analysis 2 with Beck Depression Inventory
Constant	NA	1.64	.11
Daytime dysfunction	.595	3.55	.002
Sleep medication use	–.216	−1.22	.24
Beck Depression Inventory	.049	0.22	.83

^aBolded values indicate statistical significance.

Abbreviations: NA = not applicable, PTSD = posttraumatic stress disorder.