title: Longitudinal invariance and construct validity of the abbreviated late-life function and disability instrument in healthy older adults.
abstract: OBJECTIVE
  To cross-validate the psychometric properties of the abbreviated Late-Life Function and Disability Instrument (LL-FDI), a measure of perceived functional limitations and disability.
  
  
  METHODS
  Baseline and 12-month follow-up assessments conducted across the course of a 12-month exercise program.
  
  
  METHODS
  University research community.
  
  
  METHODS
  Older healthy adults (N=179; mean ± SD age, 66.43±5.67y) at baseline; 145 were retained at follow-up.
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  LL-FDI and functional performance measures.
  
  
  RESULTS
  Factor analyses confirmed the factor structure of the abbreviated LL-FDI, and all subscales met minimal criteria for temporal invariance. Significant correlations also were found between functional limitations subscales and an array of physical function performance measures, supporting the scale's construct validity.
  
  
  CONCLUSIONS
  The abbreviated LL-FDI with some modifications appears to be temporally invariant in community-dwelling older adults. Additionally, moderate relationships between functional limitations and functional performance provide further support for these being conceptually distinct constructs.
authors: Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, 906 S. Goodwin Avenue, Urbana, IL 61801, USA.
authors: Amanda N
authors: AN
authors: Szabo
authors: Sean P
authors: SP
authors: Mullen
authors: Siobhan M
authors: SM
authors: White
authors: Thomas R
authors: TR
authors: Wojcicki
authors: Emily L
authors: EL
authors: Mailey
authors: Neha
authors: N
authors: Gothe
authors: Erin A
authors: EA
authors: Olson
authors: Jason
authors: J
authors: Fanning
authors: Arthur F
authors: AF
authors: Kramer
authors: Edward
authors: E
authors: McAuley
mesh_terms: D000368:Aged; D004185:Disability Evaluation; D005081:Exercise Therapy / Q000523:psychology*; D005260:Female; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics