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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