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Table 4 Means, standard deviations and significance level for the components of the PSQI

From: Sleep disturbances and mental strain in university students: results from an online survey in Luxembourg and Germany

 

Scale

Women

Men

Significance level

Mdn

M (SD)

Mdn

M (SD)

(1)

Sleep quality

1

 

1

 

U = 812,926; z = 1.817; p = .069

(2)

Sleep-onset latency

In minutes

2

25.48 (28.53)

2

22.52 (21.27)

U = 797,021, z = 1.285; p = .199

(3)

Sleep duration

In hours

0

7.10 (1.10)

0

7.02 (1.07)

U = 773,050; z = -.233; p = .816

(4)

Habitual sleep efficiency

In percent

0

87.35 (10.32)

0

88.81 (9.65)

U = 792,965; z = 1.190; p = .234

(5)

Sleep disturbance

1

 

1

 

U = 880,629; z = 7.144; p = .000*

(6)

Use of sleep medication

0

 

0

 

U = 786,964; z = .432; p = .666

(7)

Daytime dysfunction

1

 

1

 

U = 812,662; z = 2.510; p = .012*

  1. Mdn median; M mean; SD standard deviation; * p ≤ 0.05