Table 4.

Association between change of DBAS total score and change of sleep and other outcomes

DBAS total score change by treatment interaction on outcome change		DBAS total score (baseline to posttreatment)	Treatment (CBTI)	DBAS total score change (baseline to posttreatment) × treatment
PSQI change	Coefficient [95% CI]	−0.39 [−1.05, 0.26]	−1.25 [−2.48, −0.03]	1.31 [0.53, 2.09]
	p-value	.239	.045	.001
ISI change	Coefficient [95% CI]	−0.15 [−1.18, 0.88]	−2.28 [−4.19, −0.37]	1.80 [0.58, 3.02]
	p-value	.778	.020	.004
Sleep efficiency-D change	Coefficient [95% CI]	1.21 [−1.73, 4.16]	4.81 [−0.73, 10.34]	−2.97 [−6.45, 0.51]
	p-value	.415	.088	.093
WASO-D change	Coefficient [95% CI]	−4.61 [−14.86, 5.63]	−3.22 [−22.49, 16.06]	10.25 [−1.85, 22.36]
	p-value	.375	.742	.096
Sleep efficiency-A change	Coefficient [95% CI]	0.27 [−0.80, 1.33]	−0.91 [−2.89, 1.07]	0.24 [−1.03, 1.51]
	p-value	.622	.363	.705
ESS change	Coefficient [95% CI]	−0.36 [−0.99, 0.27]	0.43 [−0.75, 1.60]	1.00 [0.25, 1.75]
	p-value	.266	.473	.009
FFS change	Coefficient [95% CI]	−0.81 [−2.11, 0.50]	0.34 [−2.08, 2.77]	3.32 [1.78, 4.87]
	p-value	.223	.781	<.001
PHQ-9 change	Coefficient [95% CI]	0.58 [−0.21, 1.38]	0.31 [−1.17, 1.79]	0.81 [−0.14, 1.75]
	p-value	.149	.683	.093
SF-12vs physical health change	Coefficient [95% CI]	−0.87 [−2.68, 0.95]	0.77 [−2.60, 4.13]	−0.20 [−2.35, 1.95]
	p-value	.347	.652	.857
SF-12vs mental health change	Coefficient [95% CI]	−0.87 [−2.66, 0.92]	−2.04 [−5.35, 1.28]	0.11 [−2.01, 2.23]
	p-value	.337	.227	.921

DBAS, Dysfunctional Beliefs and Attitudes about Sleep; PSQI, Pittsburgh Sleep Quality Index; ISI, Insomnia Severity Index; sleep efficiency-D, sleep diary measured sleep efficiency; WASO-D, sleep diary measured wake after sleep onset; sleep efficiency-A, actigraphy measured sleep efficiency; ESS, Epworth Sleepiness Scale; FFS, Flinders Fatigue Scale; PHQ-9, Patient Health Questionnaire-9 items; SF-12, Medical Outcomes Study 12-item Short-Form health-related quality of life.