Table 1.

Baseline Demographic and Clinical Characteristics for Complete and Missing Cases (n=3,923)

Variable	Complete Cases (n=3,022)				Missing Cases (n=901)				t	χ2	df	p
	n (%)	mean		SD	n (%)	mean		SD
Age		41.05	±	13.13		40.11	±	13.50	−1.87		3915	.06
Female	1877 (62.1)				587 (65.4)					3.28	1	.07
Sleep-onset insomnia		1.75	±	1.25		1.72	±	1.28	−0.55		3918	.58
Mid-nocturnal insomnia		1.13	±	2.01		2.05	±	1.12	1.00		3919	.32
Early-morning insomnia		1.15	±	1.21		1.19	±	1.24	0.97		3918	.33
Anhedonia		2.10	±	0.77		2.07	±	0.75	−1.06		3919	.29
Severity of depressive symptoms		15.55	±	3.13		15.54	±	3.19	−0.13		3919	.90
Atypical depression	528 (17.5)				107 (14.6)					3.47	1	.06
Anxiety		6.69	±	3.04		6.63	±	3.13	−0.49		3858	.63
History of suicide attempt	508 (16.8)				137 (15.3)					1.19	1	.28
History of substance abuse	237 (7.8)				17 (9.2)					0.43	1	.51
Medical disease burden		4.20	±	3.70		4.15	±	4.15	−0.46		3921	.65
History of trauma	1451 (48.0)				387 (45.3)					1.94	1	.16
Baseline suicidal ideation	1886 (62.4)				587 (65.3)					2.48	1	.12