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Table 6 Item total correlation and Cronbach’s alpha coefficients for EDQ

From: Reliability and construct validity of the Early Dementia Questionnaire (EDQ)

Scale Item Item total correlation Cronbach alpha if item deleted Cronbach’s alpha Overall Cronbach’s alpha
Memory Require check list as memory support 0.292 0.880 0.741 0.874
Difficulty in remembering events that took place in the past 1 week (recent memory) 0.452 0.871
Unable to find kept item 0.514 0.867
Difficulty in remembering names/familiar faces 0.621 0.864
Difficulty in remembering familiar road directions 0.500 0.866
Repetitive questioning 0.530 0.865
Concentration Difficulty in following conversation 0.657 0.870 0.764
Difficulty understanding reading 0.554 0.862
Difficulty following stories on television 0.581 0.861
Physical and Emotional symptoms Difficulty carrying out daily house chores/work/hobby 0.486 0.869 0.754
Difficulty in taking care of personal hygiene or using the toilet 0.367 0.873
Disrupted movement (physical restlessness) 0.609 0.863
Unsuitable reaction towards external stimuli (example: telephone ringing - emotional outburst) 0.602 0.869
Obsession towards emotional event, although it has taken place long time ago (example: death of family member or friend) 0.376 0.872
Not interested in surroundings 0.517 0.868
Looking for support/assurance from partner 0.519 0.867
Sleep and environment Night-day rhythm disruption 0.594 0.869 0.720
Restlessness at night 0.642 0.867
Confusion after moving houses/in a new environment 0.426 0.869
Outsiders aware of changes in term of behavior/appearance 0.396 0.868