Table 2.

Pre-test, post-test, and follow-up between-group differences for all outcome measures.

Variables	Pre-test		Post-test		Follow-up
	z	p	z	p	z	p
Subjective insomnia	0.49	0.53	3.9	0.005∗∗	2.9	0.009∗
Sleep quality	0.32	0.64	4.0	0.005∗∗	3.4	0.006∗
Sleepiness	0.41	0.57	3.8	0.006∗	3.3	0.006∗
Sleep impairment	0.34	0.61	5.1	0.001∗∗∗	4.0	0.005∗∗

^∗∗∗p = 0.001; ^∗∗p = 0.005; ^∗p < 0.01.