Table 4.

Dysfunctional beliefs and attitudes and pre-sleep arousal as mediators of the intervention effect on insomnia severity

M	DV	Effect of independent variable on mediator (a)	Effect of mediator on dependent variable (b)	Indirect effect (ab), [95% CI]	Direct effect (c’)	Total effect (c)
DBAS	ISI	b= 15.33, t= -2.51, SE= 6.10 *	b= 0.07, t= 2.59, SE= 0.28 *	b= -1.12, [-2.58; -0.06] *	b= -1.49, t= -1.40, SE = 0.65	b= -2.61, [-4.79 to -0.43] *
PSAS	ISI	b= -6.14, t= -1.77, SE= 3.47	b= 0.11, t= 2.15, SE= 0.05*	b= -0.68, [-2.12; 0.03]	b= -1.93, t= -1.81, SE= 1.07	b= -2.61, [-4.79 to -0.43] *

Note. M = Mediator variable, DV = Dependent variable, Independent variable = Group allocation, DBAS = Dysfunctional Beliefs and Attitudes about Sleep Scale, PSAS = Pre-Sleep Arousal Scale, ISI = Insomnia Severity Index. * p < .05