Upon screening, overall self-reported disability or difficultywith daily mobility tasks was assessed using the EstablishedPopulations for Epidemiologic Studies in theElderly (EPESE) self-report battery. The EPESE battery19 isscored as disability or difficulty present or absent using 15Katz activity of daily living and Rosow-Breslau and Nagiitems that are relevant for mobility (such as inability toclimb stairs or carry groceries), with a score ranging from 0to 15 (higher score signifies greater disability or difficulty).