Using a time-budget method in a 3 year longitudinal study with a contr
ol group design, substantial reductions in the engagement of non-oblig
atory instrumental, social, and leisure activities could be found in a
group of mildly to moderately demented patients. Controlling these ch
anges for differences in baseline parameters, the dementia-specific re
duction was about 1 1/2 hours compared to a non-psychiatric control gr
oup. These clinically relevant changes in activity levels underscore t
he importance of these activity domains with regard to the development
of diagnostically useful indicators at the early stages of dementia.
Time-budget methods seem to be particularly useful to close the diagno
stic gap with regard to the assessment of everyday competence indicato
rs especially at early stages of the dementia illness.