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