High test-retest reliability was found for the Function component , while results for the Disability component were more variable .
Conclusions There is extensive evidence to support the construct validity and sensitivity to change of the LLFDI among various clinical population s of community-dwelling older adults .
Background The choice of measure for use as a primary outcome in geriatric research is contingent upon the construct of interest and evidence for its psychometric properties .
The Late-Life Function and Disability Instrument ( LLFDI ) has been widely used to assess functional limitations and disability in studies with older adults .
The primary aim of this systematic review was to evaluate the current available evidence for the psychometric properties of the LLFDI .
Measuring physical function in community-dwelling older persons: a comparison of self-administered, interviewer-administered, and performance-based measures.
PURPOSE To compare two self-administered , one interviewer-administered , and one performance-based measure of physical function in community-based older persons . METHODS Eighty-three subjects were recruited from meal sites , senior recreation centers , and senior housing units for a comprehensive geriatric assessment program . At the time of screening , study participants self-administered the Functional Status Question naire ( FSQ ) and were administered the Katz Activities of Daily Living ( ADL ) and the Older Americans Re sources and Services Instrumental Activities of Daily Living ( OARS-IADL ) instruments by interview . Participants also completed the Physical Performance Test ( PPT ) and were given the  Medical Outcomes Study SF-36 to self-administer on site or at home and return by mail . RESULTS All 83 subjects completed FSQ , Katz ADL , OARS-IADL , and PPT ; 72 returned SF-36 forms . Correlations between the two self-administered physical function measures ( FSQ and SF-36 ) were higher than between self-administered and interviewer-assessed ( ADL and OARS-IADL ) or performance-based ( PPT ) measures . When assessed for construct validity , the self-administered , OARS , and PPT measures had comparable correlations with role limitations as a result of physical health problems , but relationships between physical functional status measures and other SF-36 measures of health were inconsistent . CONCLUSION The relationships between commonly used self-administered , interviewer-administered , and performance-based measures of physical function were inconsistent and weak , suggesting that these instruments are not measuring the same construct
High test-retest reliability was found for the Function component , while results for the Disability component were more variable .
Conclusions There is extensive evidence to support the construct validity and sensitivity to change of the LLFDI among various clinical population s of community-dwelling older adults .
Background The choice of measure for use as a primary outcome in geriatric research is contingent upon the construct of interest and evidence for its psychometric properties .
The Late-Life Function and Disability Instrument ( LLFDI ) has been widely used to assess functional limitations and disability in studies with older adults .
The primary aim of this systematic review was to evaluate the current available evidence for the psychometric properties of the LLFDI .