title: Leukocyte telomere length is associated with disability in older u.s. Population.
abstract: OBJECTIVE
  To determine whether mean leukocyte telomere length (LTL) serves as a biomarker of disability assessed according to activities of daily living (ADLs) and what factors may modify this relationship.
  
  
  METHODS
  Retrospective cross-sectional study.
  
  
  METHODS
  A subset of the National Long Term Care Survey (NTLCS), a Medicare-based U.S. population longitudinal study focused on trends of overall health and functional status in older adults.
  
  
  METHODS
  Six hundred and twenty-four individuals from the 1999 wave of the NTLCS cohort.
  
  
  METHODS
  Relative LTL determined according to quantitative polymerase chain reaction. LTL has previously been shown to correlate with common age-related disorders and mortality, as well as with socioeconomic status.
  
  
  RESULTS
  A sex difference in LTL was observed but not age-dependent shortening or association with socioeconomic status. LTL was associated with disability and functional status assessed according to ADLs. The association between ADLs and LTL was stronger in subjects without diabetes mellitus, whereas associations were not seen when only subjects with diabetes mellitus were analyzed. Associations between LTL and cardiovascular disease (CVD) and cancer were also present in the group without diabetes mellitus but not in the group with diabetes mellitus.
  
  
  CONCLUSIONS
  These findings support the concept that LTL is a biomarker of overall well-being that is predictive of disability of older individuals in the U.S. population. Diabetes mellitus plays an important role as a modifier of the association between LTL and disability, CVD, and cancer. These associations have clinical implications because of the potential predictive value of LTL and deserve further investigation.
authors.affiliation: Department of Pathology, University of Washington, Seattle, WA 98195, USA.
authors.forename: Rosa Ana
authors.initials: RA
authors.lastname: Risques
authors.forename: Konstantin G
authors.initials: KG
authors.lastname: Arbeev
authors.forename: Anatoli I
authors.initials: AI
authors.lastname: Yashin
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Ukraintseva
authors.forename: George M
authors.initials: GM
authors.lastname: Martin
authors.forename: Peter S
authors.initials: PS
authors.lastname: Rabinovitch
authors.forename: Junko
authors.initials: J
authors.lastname: Oshima
mesh_terms: D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D007962:Leukocytes / Q000502:physiology*; D008297:Male; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D012737:Sex Factors; D012959:Socioeconomic Factors; D016615:Telomere / Q000235:genetics*
chemical_list: D015415:Biomarkers