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Table 2 Baseline differences between SWIS and WLC

From: Sleep better, feel better? Effects of a CBT-I and HT-I sleep training on mental health, quality of life and stress coping in university students: a randomized pilot controlled trial

Variable

SWIS

WLC

Test statistic

p

N

M / % (SD)

N

M / % (SD)

Mental health (ADS, PHQ)

 Depression (ADS) 0–60

39

23.54 (8.84)

15

25.40 (7.51)

t(52) = .721

.474

 Clinically relevant depressive symptoms (ADS ≥23)

39

21 (54%)

13

8 (62%)

X2(52) = .234

.629

 Somatic complaints (PHQ) 0–26

39

7.62 (4.71)

15

7.20 (4.59)

Z = −.252

.801

 Panic (PHQ) 0–11

11

3.91 (3.14)

6

5.13 (2.36)

t(17) = .919

.371

 Anxiety (PHQ) 0–12

38

7.58 (2.68)

14

7.57 (2.56)

t(50) = −.009

.993

 Alcohol abuse (PHQ) 0–5

29

.24 (.58)

12

0 (0)

Z = −1.513

.403

 General stressors (PHQ) 0–27

39

7.74 (3.40)

15

6.47 (2.89)

t(52) = − 1.284

.205

Stress coping strategies (SVF)

 Adaptive strategies

39

17.97 (2.64)

15

17.28 (3.92)

Z = −.464

.643

 Maladaptive strategies

39

19.52 (3.30)

15

19.97 (4.13)

t(52) = .415

.680

Quality of life (SEL)

 Physical condition

39

2.96 (.63)

15

2.72 (.84)

Z = −1.393

.164

 Cognitive emotional condition

39

2.79 (.56)

15

2.87 (.62)

t(52) = .440

.662

 Quality of life

39

3.13 (.54)

15

3.03 (.50)

t(52) = −.642

.524

  1. N varies across variables due to the fact that not all participants affirmed the filter questions for the three PHQ-scales panic, anxiety and alcohol abuse