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Table 3 IADCQ item mean and percentage with floor and ceiling effects

From: Impact of Alzheimer’s Disease on Caregiver Questionnaire: internal consistency, convergent validity, and test-retest reliability of a new measure for assessing caregiver burden

IADCQ Question item

Item mean

With floor score (0 = "Not at All")

With ceiling score (4 = "Extremely")

Concept

n

%*

n

%*

Physical health

1.4

44

22.0%

5

2.5%

Impact on time

2.0

23

11.5%

17

8.5%

Sadness

2.0

16

8.0%

19

9.5%

Loneliness

1.5

50

25.0%

14

7.0%

Worry

2.0

34

17.0%

31

15.5%

Frustration

2.2

21

10.5%

35

17.5%

Social activities

2.1

23

11.5%

30

15.0%

Relationship with AD patient

1.3

69

34.5%

14

7.0%

Relationship with friends or family

1.4

49

24.5%

13

6.5%

Personal finances

1.5

54

27.0%

15

7.5%

Sleep

1.9

30

15.0%

22

11.0%

Stress

2.2

10

5.0%

36

18.0%

Entire scale (sum score 0–48)

21.6

2

1.0%

2

1.0%

  1. Abbreviations: AD, Alzheimer’s disease; IADCQ, Impact of Alzheimer’s Disease on Caregiver Questionnaire.
  2. *Percent calculated as n/N (200 Internet-survey participants).