{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T14:53:04Z","timestamp":1774536784818,"version":"3.50.1"},"reference-count":15,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2004,8,16]],"date-time":"2004-08-16T00:00:00Z","timestamp":1092614400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J American Geriatrics Society"],"published-print":{"date-parts":[[2004,9]]},"abstract":"\n Objectives:<\/jats:bold>\n To assess the concurrent and predictive validity of the Late\u2010Life Function and Disability Instrument (LLFDI).\n <\/jats:p>\n \n Design:<\/jats:bold>\n Cross\u2010sectional.\n <\/jats:p>\n \n Setting:<\/jats:bold>\n University\u2010based human physiology laboratory.\n <\/jats:p>\n \n Participants:<\/jats:bold>\n One hundred one men and women aged 80.8\u00b10.4.\n <\/jats:p>\n \n Measurements:<\/jats:bold>\n A short physical performance battery (SPPB) and a self\u2010paced 400\u2010m walk (400\u2010m\u2003W) were used as performance tests of lower extremity function. The LLFDI was used to assess self\u2010reported function and physical disability. Partial correlations adjusted for age and body mass index were used to determine the concurrent and predictive validity of the LLFDI. Statistical significance was accepted at\n P<\/jats:italic>\n <\n .<\/jats:italic>\n 004 using a testwise correction.\n <\/jats:p>\n \n Results:<\/jats:bold>\n LLFDI Overall Function scores were moderately associated with the SPPB (\n r=<\/jats:italic>\n 0.65,\n P<\/jats:italic>\n <\n .<\/jats:italic>\n 001), 400\u2010m W gait speed (\n r=<\/jats:italic>\n 0.69,\n P<\/jats:italic>\n <\n .<\/jats:italic>\n 001), and measures of lower extremity function. Correlations of the two lower extremity subscores of the LLFDI (correlation coefficient (\n r<\/jats:italic>\n )=0.63\u20130.73,\n P<\/jats:italic>\n <\n .<\/jats:italic>\n 001) were greater than for the LLFDI upper extremity subscores (\n r=<\/jats:italic>\n 0.19\u20130.26,\n P<\/jats:italic>\n >.004). Performance measures of function predicted disability limitations in the range of\n r<\/jats:italic>\n =0.37\u20130.44 (\n P<\/jats:italic>\n <\n .<\/jats:italic>\n 001) and disability frequency in the range of\n r<\/jats:italic>\n =0.16\u20130.20 (\n P>.<\/jats:italic>\n 004).\n <\/jats:p>\n \n Conclusion:<\/jats:bold>\n These findings support the concurrent and predictive validity of the LLFDI. Results support the use of the LLFDI scales as a substitute for physical performance tests when self\u2010report is a preferred data\u2010collection format.\n <\/jats:p>","DOI":"10.1111\/j.1532-5415.2004.52422.x","type":"journal-article","created":{"date-parts":[[2004,8,16]],"date-time":"2004-08-16T07:02:37Z","timestamp":1092639757000},"page":"1554-1559","source":"Crossref","is-referenced-by-count":178,"title":["Validation of the Late\u2010Life Function and Disability Instrument"],"prefix":"10.1111","volume":"52","author":[{"given":"Stephen P.","family":"Sayers","sequence":"first","affiliation":[]},{"given":"Alan M.","family":"Jette","sequence":"additional","affiliation":[]},{"given":"Stephen M.","family":"Haley","sequence":"additional","affiliation":[]},{"given":"Tim C.","family":"Heeren","sequence":"additional","affiliation":[]},{"given":"Jack M.","family":"Guralnik","sequence":"additional","affiliation":[]},{"given":"Roger A.","family":"Fielding","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2004,8,16]]},"reference":[{"key":"e_1_2_5_2_2","first-page":"M85","article-title":"A short physical performance battery assessing lower extremity function","volume":"49","author":"Guralnik JM","year":"1994","journal-title":"Association with self-reported disability and prediction of mortality and nursing home admission"},{"key":"e_1_2_5_3_2","first-page":"M221","article-title":"Lower extremity function and subsequent disability","volume":"55","author":"Guralnik JM","year":"2000","journal-title":"Consistency across studies, predictive models, and value of gait speed alone compared with the short physical performance battery"},{"key":"e_1_2_5_4_2","first-page":"311","article-title":"Objective and self\u2010assessed health in the old and very old","volume":"14","author":"Linn BS","year":"1980","journal-title":"Soc Sci Med"},{"key":"e_1_2_5_5_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1532-5415.1995.tb05540.x"},{"key":"e_1_2_5_6_2","first-page":"1103","article-title":"Measuring functional status","volume":"49","author":"Hoeymans N","year":"1996","journal-title":"Cross-sectional and longitudinal associations between performance and self-report (Zutphen Elderly Study 1990\u201393)"},{"key":"e_1_2_5_7_2","first-page":"M644","article-title":"Measuring higher level physical function in well\u2010functioning older adults","volume":"56","author":"Simonsick EM","year":"2001","journal-title":"Expanding familiar approaches in the Health ABC Study"},{"key":"e_1_2_5_8_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1532-5415.2001.49232.x"},{"key":"e_1_2_5_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/0277-9536(94)90294-1"},{"key":"e_1_2_5_10_2","doi-asserted-by":"publisher","DOI":"10.1093\/gerona\/57.4.M209"},{"key":"e_1_2_5_11_2","doi-asserted-by":"publisher","DOI":"10.1093\/gerona\/57.4.M217"},{"key":"e_1_2_5_12_2","doi-asserted-by":"crossref","unstructured":"DubucN HaleySM NiP KooyoomjianJ JetteAM.Function and disability in late life: comparison of the Later Life Function and Disability Instrument to the Short\u2010Form\u201036 and the London Handicap Scale. 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