This study examined the relationship between a recently published measure of cognitive status and well-established measures of functional ability in severely impaired demented elderly. Fifty outpatients with severe cognitive impairment were administered the Severe Impairment Battery, Clinical Dementia Rating Scale, Activities of Daily Living and Instrumental Activities of Daily Living scales. Total scores on the Severe Impairment Battery were significantly associated with measures of functional ability and CDR. Some but not all subscale scores of the SIB correlated significantly with measures of functional status. The data presented in this study document the relationship between the SIB and measures of functional status, and suggest the need for more appropriate ADL measures for use with severely impaired patients.
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