The study was based on an epidemiological model in which performing ac
tivities of daily living (ADL) was the dependent variable. Variation i
n performing was explained by physical and mental health, and by physi
cal performance. The population consisted of all 80-year-old residents
(N=291) of the city of Jyvaskyla in central Finland; 90% of them agre
ed to take part in the interviews at home, while 72% took part in the
laboratory examinations to determine health status and functional capa
city.. Difficulties in at least some PADL (Physical Activities of Dail
y Living) tasks were reported by 86.5% of the men, and 87.2% of the wo
men; none said they could perform all IADL (Instrumental Activities of
Daily Living) tasks without difficulty. Physical performance (grip st
rength and stair mounting test in men, and stair mounting test, balanc
e, and upper extremity function test in women) and visual acuity showe
d a significant association with ADL performance both in men and in wo
men. In addition, depressive symptoms in women, and cognitive capacity
in men were associated with both PADL and IADL, and ADL performance,
respectively. In the search for pathways to reduced ADL performance, i
t is important to look not only at chronic dis eases but also at the a
ging processes as well as the disabilities caused by inactivity. Tests
of cognitive capacity, psychological well-being and physical performa
nce provide valuable information on the factors that underlie the aged
individual's reduced functional capacity.