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Table 3 Factor loading of the FAS and the MH-SF36 obtained in 73 patients with SLE in a two-factor solution

From: The Fatigue Assessment Scale as a simple and reliable tool in systemic lupus erythematosus: a cross-sectional study

Items Factor 1 - fatigue Factor 2 - mental health
I am bothered by fatigue (FAS-1) 0.94 0.10
I get tired very quickly (FAS-2) 0.94 0.08
I do not do much during the day (FAS-3) 0.75 0.08
I have enough energy for everyday life (FAS-4) − 0.74 − 0.13
Physically, I feel exhausted (FAS-5) 0.89 0.01
I have problems starting things (FAS-6) 0.62 − 0.32
I have problems thinking clearly (FAS-7) 0.37 − 0.51
I feel no desire to do anything (FAS-8) 0.65 − 0.25
Mentally, I feel exhausted (FAS-9) 0.62 − 0.25
When I am doing something, I can concentrate quite well (FAS-10) − 0.77 − 0.20
Have you been a very nervous person? (SF09B) 0.18 0.97
Have you felt so down in the dumps that nothing could cheer you up? (SF09C) − 0.05 0.87
Have you felt calm and peaceful? (SF09D) 0.20 − 0.67
Have you felt downhearted and low? (SF09F) 0.02 0.91
Have you been a happy person? (SF09H) 0.17 − 0.68
  1. FAS Fatigue Assessment Scale, MH-SF36 mental health component of the Short Form 36 health survey questionnaire
  2. A coefficient factor above 0.3 was considered significant