Skip to main content

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).