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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)

From: Validation of a three-item Fatigue Severity Scale for patients with substance use disorder: a cohort study from Norway for the period 2016–2020

  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
  1. This table displays descriptive information of the FSS-9 and VAFS scores at baseline. The FSS-9 was answered on a Likert scale from 1 (no fatigue) to 7 (worst fatigue). The VAFS was answered by placing a mark on a line from 0 (no fatigue) to 10 (worst fatigue). The items in bold represent the FSS-3 items.
  2. FSS Fatigue Severity Scale, I item, IQR interquartile range (25–75 percentiles), SD standard deviation, SE standard error