From the Centre of Applied and Preventive Cardiovascular Medicine (M.J.) and the Departments of Medicine (J.S.A.V., T.R.), Biostatistics (H.H.), and Clinical Physiology (O.T.R.), University of Turku, Turku; the Department of Clinical Physiology (T.L.), University of Kuopio, Kuopio; and the Department of Health and Functional Capacity (J.M.), National Public Health Institute, Turku, Finland. (At 2004-11-02)