Table 1.

Sample Characteristics of Depression and Anxiety Sufferers Experiencing Chronic Sleep Maintenance Insomnia Characterized by Nighttime Awakenings (CINA) Versus No Insomnia

	Depression Sufferers (n = 2,318)			Anxiety Sufferers (n = 1,832)
Variable	CINA (n = 643)	No Insomnia (n = 1,675)	P Value	CINA (n = 476)	No Insomnia (n = 1,356)	P Value
Female, %	63	59	.112	60	60	.799
Age, mean (SD), y	48.7 (12.5)	46.6 (15.5)	.002	48.7 (12.3)	46.8 (16.2)	.017
Nonwhite, %	17	18	.432	16	16	.913
No. of physical comorbid conditions, mean (SD)	3.8 (2.3)	2.4 (2.0)	< .001	4.0 (2.4)	2.5 (1.9)	< .001