Table 2 Factor analysis for the 9-item FSS and 7-item FSS
From: Psychometric properties of fatigue severity scale in Chinese systemic lupus erythematosus patients
Item | Factor loading | Factor loading |
|---|---|---|
Item1(My motivation is lower when I am fatigued) | 0.59 | _ |
Item2(Exercise brings on my fatigue) | 0.67 | _ |
Item3 (I am easily fatigued) | 0.70 | 0.67 |
Item4 (Fatigue interferes with my physical functioning) | 0.86 | 0.86 |
Item5 (Fatigue causes frequent problems for me) | 0.86 | 0.88 |
Item6 (My fatigue prevents sustained physical functioning) | 0.86 | 0.87 |
Item7 (Fatigue interferes with carrying out certain duties and responsibilities) | 0.85 | 0.86 |
Item8 (Fatigue is among my three most disabling symptoms) | 0.85 | 0.86 |
Item9 (Fatigue interferes with my work, family or social life) | 0.80 | 0.83 |
Eigenvalues | 5.56 | 4.87 |
Total variance (%) | 61.80 | 69.54 |
KMO | 0.92 | 0.91 |