Table 4.

Wilcoxon test for related samples of the pre-test to post-test, pre-test to follow-up, and post-test to follow-up differences in the study variables in the intervention group.

Variables	Pre–Post		Pre–Follow-up		Post–Follow-up
	z	P	z	p	z	P
Subjective insomnia	4.4	0.000∗∗∗∗	3.9	0.005∗∗	0.29	0.687
Sleep quality	5.1	0.000∗∗∗∗	3.6	0.007∗	0.57	0.416
Sleepiness	4.2	0.001∗∗∗	3.6	0.008∗	0.32	0.631
Sleep impairment	4.1	0.001∗∗∗	3.8	0.005∗∗	0.43	0.529

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