Table 2 Descriptive information of the Nine-item Fatigue Severity Scale (FSS-9) and Visual Analog Fatigue Scale (VAFS) at baseline (FSS-9: N = 654, VAFS: N = 655)
Mean | SD | Median | IQR | Skewness (SE) | Kurtosis (SE) | Variance | |||
|---|---|---|---|---|---|---|---|---|---|
FSS-9 items | |||||||||
I1: My motivation is lower when I am fatigued | 5.38 | 2.04 | 6.00 | 5.00–7.00 | − 1.14 (0.10) | − 0.09 (0.19) | 4.16 | ||
I2: Exercise brings on my fatigue | 4.73 | 2.12 | 5.00 | 3.00–7.00 | − 0.54 (0.10) | − 1.11 (0.19) | 4.49 | ||
I3: I am easily fatigued | 4.54 | 2.15 | 5.00 | 3.00–7.00 | − 0.42 (0.10) | − 1.24 (0.19) | 4.60 | ||
I4: Fatigue interferes with my physical functioning | 4.95 | 2.07 | 6.00 | 3.00–7.00 | − 0.74 (0.10) | − 0.81 (0.19) | 4.27 | ||
I5: Fatigue causes frequent problems for me | 4.43 | 2.22 | 5.00 | 2.00–7.00 | − 0.31 (0.10) | − 1.39 (0.19) | 4.91 | ||
I6: My fatigue prevents sustained physical functioning | 4.62 | 2.19 | 5.00 | 2.00–7.00 | − 0.48 (0.10) | − 1.22 (0.19) | 4.79 | ||
I7: Fatigue interferes with carrying out certain duties and responsibilities | 5.00 | 2.14 | 6.00 | 4.00–7.00 | − 0.84 (0.10) | − 0.75 (0.19) | 4.56 | ||
I8: Fatigue is among my three most disabling symptoms | 4.64 | 2.34 | 5.00 | 2.00–7.00 | − 0.50 (0.10) | − 1.35 (0.19) | 5.48 | ||
I9: Fatigue interferes with my work, family, or social life | 4.85 | 2.17 | 5.00 | 3.00–7.00 | − 0.69 (0.10) | − 0.95 (0.19) | 4.72 | ||
VAFS | 5.19 | 2.65 | 5.00 | 3.00–7.00 | − 0.29 (0.10) | − 0.78 (0.19) | 7.04 | ||