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Table 4 Item-level psychometrics

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 item Concept Correlation with total Cronbach’s coefficient alpha
Item 1 Physical health 0.672 0.921
Item 2 Impact on time 0.780 0.917
Item 3 Sadness 0.637 0.922
Item 4 Loneliness 0.701 0.920
Item 5* Worry 0.523 0.928
Item 6 Frustration 0.729 0.919
Item 7 Social activities 0.723 0.919
Item 8 Relationship with AD patient 0.637 0.923
Item 9 Relationship with friends or family 0.763 0.918
Item 10 Personal finances 0.579 0.925
Item 11 Sleep 0.763 0.917
Item 12 Stress 0.785 0.917
Overall coefficient alpha 0.927
  1. Abbreviation: AD, Alzheimer’s disease.
  2. *The correlation of Item 5 is significantly different from the average correlation of the entire scale, where z score is 2.7 and p value is 0.006.