Table 8.

Means, standard deviations and significance level for the components of the PSQI in both countries

	Scale	Germany		Luxembourg		Significance level
		Mdn	M (SD)	Mdn	M (SD)
(1)	Sleep quality	1		1		U = 241,562; z = −1.207; p = .228
(2)	Sleep-onset latency In minutes	2	24.47 (26.85)	2	27.84 (26.05)	U = 257,277, z = 1.888; p = .059
(3)	Sleep duration In hours	0	7.09 (1.08)	0	6.94 (1.17)	U = 256,345; z = 1.615; p = .106
(4)	Habitual sleep efficiency In percent	0	87.83 (10.11)	0	86.30 (10.92)	U = 258,207; z = 1.833; p = .067
(5)	Sleep disturbance	1		1		U = 242,547; z = −.177; p = .907
(6)	Use of sleep medication	0		0		U = 241,562; z = −.485; p = .628
(7)	Daytime dysfunction	1		2		U = 242,553; z = .473; p = .636

Mdn median; M mean; SD standard deviation; p ≤ 0.05