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Table 1 ePDQ item-total correlations with domain floor and ceiling effects and Cronbach’s alpha values

From: Evaluating the psychometric properties of an e-based version of the 39-item Parkinson’s Disease Questionnaire

Domain

Item no

Item

Item-total correlation (corrected)

% Floor

% Ceiling

α

Mobility

 

1.7

4.2

0.95

 

1

Had difficulty doing leisure activities

0.69

   
 

2

Had difficulty looking after your home

0.76

   
 

3

Had difficulty carrying bags of shopping

0.73

   
 

4

Had problems walking half a mile

0.86

   
 

5

Had problems walking 100 yards

0.87

   
 

6

Had problems getting around the house

0.84

   
 

7

Had difficulty getting around in public places

0.90

   
 

8

Needed to be accompanied when out

0.78

   
 

9

Frightened or worried about falling in public

0.67

   
 

10

Been confined to the house more than liked

0.82

   

Activities of daily living

 

0.8

1.7

0.88

 

11

Had difficulty washing yourself

0.72

   
 

12

Had difficulty dressing yourself

0.80

   
 

13

Had problems doing up buttons or laces

0.78

   
 

14

Had problems writing clearly

0.49

   
 

15

Had difficulty cutting up food

0.80

   
 

16

Had difficulty holding a drink

0.65

   

Emotional well-being

 

0.8

5.9

0.88

 

17

Felt depressed

0.71

   
 

18

Felt isolated and lonely

0.80

   
 

19

Felt weepy or tearful

0.72

   
 

20

Felt angry or bitter

0.67

   
 

21

Felt anxious

0.63

   
 

22

Felt worried about the future

0.68

   

Stigma

 

0.8

22.0

0.83

 

23

Felt you had to conceal PD from people

0.57

   
 

24

Avoided eating or drinking in public

0.54

   
 

25

Felt embarrassed by having PD

0.80

   
 

26

Felt worried by other’s reaction to you

0.73

   

Social support

 

0.8

39.8

0.76

 

27

Had problems with close relationships

0.58

   
 

28

Not had support from spouse or partner

0.66

   
 

29

Not had support from friends or family

0.57

   

Cognitive impairment

 

0.8

1.7

0.64

 

30

Unexpectedly fallen asleep during day

0.38

   
 

31

Had problems with concentration

0.59

   
 

32

Felt your memory was bad

0.40

   
 

33

Had distressing dreams or hallucinations

0.35

   

Communication

 

0.8

21.2

0.87

 

34

Had difficulty with speech

0.78

   
 

35

Felt unable to communicate properly

0.82

   
 

36

Felt ignored by people

0.67

   

Bodily discomfort

 

0.8

6.8

0.71

 

37

Had painful muscle cramps or spasms

0.60

   
 

38

Had aches and pains

0.58

   
 

39

Felt unpleasantly hot or cold

0.41