Table 3.

Friedman test for k related samples for each study variable in the intervention and control groups.

Group	Control		Intervention
Variables	χ2	P	χ2	P
Subjective insomnia	1.3	0.51	10.7	0.008∗
Sleep quality	2.3	0.45	11.4	0.006∗
Sleepiness	1.9	0.48	12.7	0.003∗∗
Sleep impairment	2.9	0.39	13.4	0.001∗∗∗

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