Development and Validation of the Lewy Body Disease Caregiver Activities Scale.

Background and Purpose: Caring for someone with Lewy body disease (LBD) is difficult. This study describes the development and validity testing of the LBD Caregiver Activities Scale (LBD-CAS). Methods: Caregiver interviews informed the development of the LBD-CAS. Experts estimated the content validity of items (I-CVI) and provided feedback about the scale. Family caregivers evaluated items for face validity. Results: Expert I-CVI ratings yielded 49 items with scores of 0.83 or higher. Four items with I-CVI scores <.83 were retained due to conceptual significance. The overall scale CVI was 0.86. Items evaluated by caregivers for face validity showed excellent variability in responses, with no major ceiling or floor effects. Conclusions: LBD-CAS showed evidence of content and face validity for the assessment of activities performed by LBD caregivers. Further psychometric testing is recommended.