“…Functional disability was defined as the need for assistance or inability to perform ADL or IADL. Of the 27 studies reporting on ADL, 15 studies used Barthel Index(14, 17, 20-22, 24, 28, 29, 32, 34-36, 43, 48, 50), while several studies reported the use of Katz scale(22,28,29,33,39,42,44) and other ADL assessments. The Lawton and Brody scale was used in 14 studies to assess IADL(14, 17, 26, 27, 30-32, 34, 39, 41-44, 49).…”