Table 4.

Estimates of fixed effects of multilevel model for sleep diary measures and pre-sleep arousal measures

Dependent variable	Fixed effects	Coefficient	SE	t	P
Sleep diary measures		γ
Sleep onset latency	Intercept	1.48	0.04	32.16	< 0.001
	Gender	-0.07	0.05	-1.41	0.160
	Group	0.10	0.05	2.05	0.041
Wake after sleep onset	Intercept	1.66	0.05	34.51	< 0.001
	Gender	0.02	0.05	0.49	0.624
	Group	-0.04	0.05	-0.77	0.444
Total sleep time	Intercept	353.44	10.15	24.60	< 0.001
	Gender	19.08	11.09	1.72	0.087
	Group	-0.84	11.08	-0.07	0.940
Sleep efficiency	Intercept	1.06	0.02	52.75	< 0.001
	Gender	0.02	0.02	0.80	0.424
	Group	-0.02	0.02	-1.02	0.307
Pre-sleep arousal ratings (VAS)
Active mind	Intercept	0.65	0.04	15.81	< 0.001
	Gender	0.01	0.04	0.34	0.731
	Group	0.10	0.04	2.23	0.027
Anxious	Intercept	0.53	0.04	13.61	< 0.001
	Gender	-0.02	0.04	-0.45	0.650
	Group	0.10	0.04	2.41	0.017

Gender variable was coded as 0: Male and 1: Female. Group variable was coded as 0: Primary insomnia and 1: Insomnia related to a mental disorder.

VAS, visual analogue scale.