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Table 4 Correlations between the primary and secondary outcome variables

From: Sleep quality, daytime sleepiness, fatigue, and quality of life in patients with multiple sclerosis treated with interferon beta-1b: results from a prospective observational cohort study

 

Baseline visit

12-month visit

24-month visit

PSQI (total score)

MFIS (total score)

PSQI (total score)

MFIS (total score)

PSQI (total score)

MFIS (total score)

N

rs

p

N

rs

p

N

rs

p

N

rs

p

N

rs

p

N

rs

p

PSQI (total score)

 

106

0.62

<.0001

 

82

0.68

<.0001

   

41

0.66

<.0001

MFIS(total score)

106

0.62

<.0001

 

82

0.68

<.0001

 

41

0.66

<.0001

   

SF-36

 Physical component score (PCS)

100

−0.54

<.0001

113

− 0.72

<.0001

81

−0.63

<.0001

85

−0.75

<.0001

40

−0.61

<.0001

42

−0.72

<.0001

 Mental component score (MCS)

100

−0.47

<.0001

113

−0.68

<.0001

81

−0.57

<.0001

85

−0.81

<.0001

40

−0.78

<.0001

42

−0.78

<.0001

ESS score

103

0.27

0.0049

   

82

0.55

<.0001

   

40

0.49

0.0011

   

HADS anxiety

105

0.56

<.0001

   

81

0.51

<.0001

   

41

0.53

0.0002

   

HADS depression

105

0.60

<.0001

   

81

0.44

<.0001

   

41

0.55

0.0001

   

HSAL score

6

0.93

0.0045

   

5

0.97

0.0021

   

3

1.00

.

   

IRLSSG score

4

0.50

0.5828

   

3

0.50

.

   

2

1.00

.

   
  1. Strong correlations are highlighted in bold numbers. PSQI Pittsburgh Sleep Quality Index, MFIS Modified Fatigue Impact Scale, SF-36 Short Form-36, ESS Epworth Sleepiness Scale, HADS Hospital Anxiety and Depression Scale, HSAL Hamburg Pain Adjective List, IRLSSG International Restless Legs Symptom Study Group