Table 3: T-value, Pearson correlation coefficient, factor loadings, ICC and Cronbach Alpha of the Sleep-50 (N = 421).

Factor

No

tvaluea

 (λ)b

Rc

Cronbach Alpha

Factor 5

Q1

12.1

0.56***

0.388**

0.878

 

Q2

13.77

0.63***

0.607**

 

Sleep apnea

Q3

21.79

0.87***

0.531**

 

 

Q4

14.17

0.64***

0.497**

 

 

Q5

15.69

0.69***

0.570**

 

 

Q6

20.57

0.84***

0.495**

 

 

Q7

15.11

0.67***

0.498**

 

 

Q8

15.5

0.69***

0.569**

 

Factor 3

Q9

21.72

0.86***

0.569**

0.893

 

Q10

21.87

0.87***

0.618**

 

Insomnia

Q11

18.39

0.77***

0.599**

 

 

Q12

18.51

0.78***

0.587**

 

 

Q13

10.42

0.49***

0.321**

 

 

Q14

13.24

0.60***

0.376**

 

 

Q15

12.44

0.57***

0.360**

 

 

Q16

16.73

0.72***

0.468**

 

Factor 6

Q17

11.46

0.55***

0.444**

0.834

 

Q18

16.57

0.73***

0.509**

 

Narcolepsy

Q19

17.51

0.76***

0.549**

 

 

Q20

16.82

0.74***

0.585**

 

 

Q21

18.55

0.79***

0.572**

 

Factor 9

Q22

12.09

0.58***

0.419**

0.784

 

Q23

14.92

0.68***

0.584**

 

RLS/PLMD

Q24

19.84

0.84***

0.613**

 

 

Q25

15.35

0.70***

0.536**

 

Factor1

Q26

17.68

0.78***

0.560**

0.767

 

Q27

20.11

0.86***

0.627**

 

CRSD

Q28

11.22

0.54***

0.393**

 

Factor 8

Q29

15.81

0.72***

0.472**

0.735

Sleep walking

Q30

14.48

0.68***

0.376**

 

 

Q31

17.48

0.78***

0.598**

 

Factor 4

Q32

22.87

0.89***

0.544**

0.912

Nightmares

Q33

21.49

0.86***

0.485**

 

 

Q34

2.69

0.84***

0.432**

 

 

Q35

17.86

0.76***

0.375**

 

 

Q36

18.98

0.79***

0.576**

 

Factor 2

Q37

18.15

0.77***

0.435**

0.878

Factors influencing sleep

Q38

21.12

0.85***

.501**

 

 

Q39

18.79

0.79***

0.362**

 

 

Q40

16.33

0.71***

0.366**

 

 

Q41

18.94

0.79***

0.487**

 

 

Q42

12.69

0.59***

0.552**

 

 

Q43

13.29

0.61***

0.586**

 

Factor 7

Q44

20.77

0.84***

0.700**

0.895

Impact of sleep complaints on daily functioning

Q45

19.4

0.80***

0.641**

 

 

Q46

20.73

0.84***

0.691**

 

 

Q47

11.68

0.54***

0.474**

 

 

Q48

18.36

0.77***

0.677**

 

 

Q49

15.69

0.69***

0.651**

 

 

Q50

16.87

0.73***

0.681**

 

Factor

No

tvaluea

 (λ)b

Rc

Cronbach Alpha

0.945

***P < 0.001; **P < 0.01; *P < 0.05
A) The calculated values for all factor loadings of the first and second orders are greater than 1.96 and are therefore significant at the 95% confidence level; B) The specific value, which is denoted by the Lamda coefficient and the statistical symbol λ, is calculated from the sum of the factors of the factor loads related to all the variables of that factor; C) Pearson Correlation coefficient