Table 2.

Adjusted Means and Change Scores on Sleep Measures According to Group, Comorbidity Status and Time

	Cognitive-Behavior Therapy			Cognitive Therapy			Behavior Therapy
Time/change scores	No comorbidity (n = 45) M (SE)	With Comorbidity (n = 15) M (SE)	t	No comorbidity (n = 50) M (SE)	With Comorbidity (n = 15) M (SE)	t	No comorbidity (n = 48) M (SE)	With Comorbidity (n = 15) M (SE)	t
Insomnia Severity Index (Total ISI Score)
Pre	17.7 (0.5)	18.4 (0.7)	0.63, p=.43	17.1 (0.5)	19.2 (1.0)	3.43, p=.07	17.7 (0.5)	20.2 (0.8)	7.44, p<.01
Post	7.7 (0.6)	6.6 (0.9)	0.90, p=.34	8.3 (0.6)	12.7 (1.4)	8.70, p<.01	8.0 (0.6)	11.9 (1.7)	4.73, p=.03
FU6	7.6 (0.7)	7.2 (1.1)	0.10, p=.75	8.3 (0.8)	10.1 (1.6)	1.05, p=.31	9.0 (0.7)	11.4 (1.8)	1.64, p=.20
Change Pre-Post	−10.0	−11.8	1.26, p=.21	−8.8	−6.5	1.43, p=.15	−9.7	−8.3	0.70, p=.48
Change Pre-FU6	−10.1	−11.2	0.72, p=.47	−8.8	−9.1	0.11, p=.91	−8.7	−8.8	0.02, p=.98
Percentage of Treatment Responders (reduction of at least 8 points from baseline on the ISI)
Pre
Post	71.1 (7.8)	80.8 (10.8)	0.46, p=.50	57.6 (7.1)	23.6 (9.8)	5.68, p=.02	81.6 (6.1)	34.4 (14.5)	7.51, p<.01
FU6	74.1 (7.4)	73.5 (11.3)	0.00, p=.96	78.4 (6.6)	45.2 (16.3)	3.69, p=.06	52.5 (9.0)	29.3 (13.8)	1.65, p=.20
Percentage in Remission (ISI score < 8)
Pre
Post	56.8 (8.1)	73.3 (12.2)	1.10, p=.30	38.4 (7.5)	20.2 (11.1)	1.42, p=.23	51.1 (7.4)	23.1 (12.0)	2.86, p=.09
FU6	57.5 (7.8)	66.9 (13.2)	0.35, p=.55	60.7 (7.8)	39.2 (13.6)	1.77, p=.19	41.6 (7.6)	39.7 (14.0)	0.01, p=.90

^*p < .05,

^**p < .01,

^***p < .001

Note. All means (standard errors) and change scores are adjusted for site effect. Error df = 317 for ISI and 150 for ISI Response and Remission.