Differences in Activities of Daily Living Process Skills of Persons with and without Alzheimer's Disease

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Abstract
The purpose of this study was to determine if persons with dementia of the Alzheimer type (DAT) differed from nondisabled older controls in the actual, experienced difficulty of specific process skills that affect performance of activities of daily living (ADL). A two-group comparison was performed and all participants were evaluated in either clinical or home environments to which they had been familiarized. Participants (341 persons with DAT and 287 controls) were selected from the standardization sample of the Assessment of Motor and Process Skills (AMPS) computer-scoring software. The demographic characteristics of the two groups were comparable. The AMPS was used to evaluate the effort, efficiency, safety, and independence of 20 ADL process skills that are compiled to enact performance of familiar ADL tasks. The raw data for each sample was subjected to many-faceted Rasch analysis to determine item difficulty calibrations of the ADL process skill items for each group. Actual item difficulty calibrations of 19 ADL process skills differed meaningfully between the two groups. The results indicated that it is possible to identify specific ADL process skills that are actually easier or more difficult for each group. In addition, the results supported earlier research that has demonstrated that the underlying cognitive and physical impairments demonstrated by persons with DAT do manifest as ADL disability, negatively impacting their ability to perform ADL tasks.