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Table 4 Simple statistics and standardized Cronbach coefficient alpha of the fatigue scales

From: The dimensionality of fatigue in Parkinson’s disease

Item Label Mean (SD) Range Standardized Cronbach coefficient alpha
Fatigue Severity Scale (FSS)
 1 My motivation is lower when I am fatigued 4.3 (1.9) 1–7 0.969
 2 Exercise brings on my fatigue 3.2 (1.7) 1–7 0.970
 3 I am easily fatigued 3.8 (2.3) 1–7 0.967
 4 Fatigue interferes with my physical functioning 3.4 (2.0) 1–7 0.968
 5 Fatigue causes frequent problems for me 3.1 (2.2) 1–7 0.967
 6 My fatigue prevents sustained physical functioning 3.3 (2.2) 1–7 0.967
 7 Fatigue interferes with carrying out certain duties and responsibilities 3.4 (2.1) 1–7 0.967
 8 Fatigue is among my most disabling symptoms 3.4 (2.4) 1–7 0.967
 9 Fatigue interferes with my work, family, or social life 3.6 (2.3) 1–7 0.967
Parkinson Fatigue Scale (PFS)
 1 I have to rest during the day 3.0 (1.4) 1–5 0.968
 2 My life is restricted by fatigue 2.5 (1.4) 1–5 0.967
 3 I get tired more quickly than other people I know 2.9 (1.5) 1–5 0.967
 4 Fatigue is one of my three worst symptoms 2.8 (1.6) 1–5 0.967
 5 I feel completely exhausted 2.3 (1.4) 1–5 0.967
 6 Fatigue makes me reluctant to socialise 2.2 (1.4) 1–5 0.968
 7 Because of fatigue it takes me longer to get things done 3.0 (1.5) 1–5 0.967
 8 I have a feeling of ‘heaviness’ 2.2 (1.3) 1–5 0.968
 9 If I wasn’t so tired I could do more things 2.8 (1.4) 1–5 0.967
 10 Everything I do is an effort 2.3 (1.3) 1–5 0.967
 11 I lack energy for much of the time 2.6 (1.3) 1–5 0.967
 12 I feel totally drained 2.4 (1.3) 1–5 0.967
 13 Fatigue makes it difficult for me to cope with everyday activities 2.4 (1.3) 1–5 0.967
 14 feel tired even when I haven’t done anything 2.4 (1.3) 1–5 0.968
 15 Because of fatigue I do less in my day than I would like 2.7 (1.4) 1–5 0.967
 16 I get so tired I want to lie down wherever I am 2.1 (1.4) 1–5 0.967
Visual Analog Fatigue Scale (VAFS)
 – Visual Analog Fatigue Scale 6.5 (2.7) 2–10 0.979
  1. The one-factor solution comprising all the items of the three scales explained 67% of the total variance, suggesting that the items from the three scales were unidimensional. The overall standardized alpha coefficient was 0.97. The most reliable item was the VAFS, with a coefficient of 0.979