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 |