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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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Health and Quality of Life Outcomes

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