Table 2 Correlation of thirteen items and PDF scale score

1

Fatigue

0.802

<0.001

2

General malaise

0.802

<0.001

3

Feel exhausted and weak

0.833

<0.001

4

Lightheadedness

0.726

<0.001

5

Need to lie down and take a nap or rest

0.791

<0.001

6

Difficulty moving without taking a nap or rest

0.839

<0.001

7

No appetite

0.463

<0.001

8

Headache

0.576

<0.001

9

Thoracic discomfort

0.52

<0.001

10

Toothache

0.436

<0.001

12

Do not want to move

0.844

<0.001

13

Unmotivated to do anything

0.815

<0.001

14

Following dialysis, feel pain and end up doing nothing all day

0.784

<0.001