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Table 4 Internal consistency of the MFSI-SF subscales and the corrected item-to-domain Spearman’s correlations

From: Psychometric properties and measurement equivalence of the Multidimensional Fatigue Syndrome Inventory- Short Form (MFSI-SF) amongst breast cancer and lymphoma patients in Singapore

Domain/Scale Item Content (Listed in English) Total MFSI-SF score of English and Chinese versions (N = 246) English version of MFSI-SF (n = 160) Chinese version of MFSI-SF (n = 86)
Corrected item-to-domain correlationa Cronbach’s α Corrected item-to-domain correlation Cronbach’s α Corrected item-to-domain correlation Cronbach’s α
General (6 items)     0.914   0.917   0.904
  10 I feel pooped 0.611   0.530   0.765  
12 I feel worn out 0.726   0.694   0.778  
14 I feel fatigued 0.758   0.769   0.715  
17 I feel sluggish 0.624   0.686   0.474  
18 I feel run down 0.732   0.761   0.747  
28 I feel tired 0.773   0.751   0.783  
Physical (6 items)     0.863   0.889   0.749
  2 My muscles ache 0.614   0.685   0.463  
4 My legs feel weak 0.616   0.676   0.479  
6 My head feels heavy 0.477   0.491   0.450  
16 My arms feel weak 0.568   0.608   0.503  
19 I ache all over 0.632   0.702   0.476  
26 My body feels heavy all over 0.629   0.686   0.502  
Emotional (6 items)     0.912   0.921   0.887
  3 I feel upset 0.746   0.737   0.764  
8 I feel nervous 0.676   0.699   0.632  
13 I feel sad 0.789   0.789   0.787  
21 I feel depressed 0.723   0.720   0.727  
23 I feel tense 0.685   0.732   0.600  
30 I am distressed 0.678   0.655   0.730  
Mental (6 items)     0.921   0.928   0.889
  1 I have trouble remembering things 0.748   0.784   0.674  
11 I am confused 0.615   0.622   0.603  
15 I have trouble paying attention 0.729   0.780   0.635  
20 I am unable to concentrate 0.716   0.740   0.671  
25 I make more mistakes than usual 0.679   0.671   0.701  
27 I am forgetful 0.781   0.798   0.756  
Vigour (6 items)     0.936   0.944   0.917
  5 I feel cheerful 0.833   0.827   0.844  
7 I feel lively 0.820   0.868   0.719  
9 I feel relaxed 0.790   0.839   0.690  
22 I feel refreshed 0.833   0.829   0.843  
24 I feel energetic 0.853   0.853   0.862  
29 I feel calm 0.803   0.833   0.749  
  1. All correlations were significant at the 0.01 level (two tailed)
  2. All Cronbach’s alpha coefficient was above the satisfactory level of 0.7
  3. All items had satisfactory item-to-domain correlation (defined by a corrected r > 0.300)
  4. MFSI-SF Multidimensional Fatigue Symptom Inventory - Short Form
  5. aThe corrected item-to-domain correlation was calculated for each item by removing the contribution of the item’s score to its corresponding subscale score
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