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Table 6 External construct validity.

From: Development of a patient reported outcome scale for fatigue in multiple sclerosis: The Neurological Fatigue Index (NFI-MS)

Scale

Summary

Physical

Cognitive

Nocturnal sleep

Diurnal sleep

Physical

0.96

    

Cognitive

0.85

0.71

   

Nocturnal sleep

0.62

0.60

0.55

  

Diurnal sleep

0.65

0.63

0.55

0.51

 

MFIS phys-8

0.71

0.72

0.55

0.44

0.51

MFIS cog-5

0.58

0.48

0.69

0.46

0.37

FSS-5

0.71

0.71

0.57

0.43

0.54

VAS

0.67

0.67

0.52

0.50

0.46

  1. Pearson correlation coefficients (Spearman for the VAS) between the Rasch derived person locations of the NFI-MS scales and the comparator scales.
  2. p < 0.001 for all correlations.
  3. MFIS = Modified Fatigue Impact Scale, FSS = Fatigue Severity Scale, VAS = visual analogue scale.
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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