title: The influence of lower-extremity function in elderly individuals' quality of life (QOL): an analysis of the correlation between SPPB and EQ-5D.
abstract: BACKGROUND
  If an association between a decline in physical performance and subjective QOL is confirmed, the SPPB could be used as a predictor for declining QOL in older people.
  
  
  OBJECTIVE
  This study aimed to elucidate the association between the short physical performance battery (SPPB) and QOL (EQ-5D) to determine the utility of the SPPB as a predictor of declining QOL.
  
  
  METHODS
  The SPPB and the EQ-5D test were performed with a random sample of participants nested in the Korean Longitudinal Study of Aging (KLoSA) panel. Comparisons of the adjusted mean scores on the EQ-5D index between normal and abnormal SPPB groups were performed. We selected the quartiles of the EQ-5D index variables for the analysis. The association between the EQ-5D index and SPPB abnormality was examined using multinomial logistic regression analysis. Additionally, the associations between gait speed and chair stand time and the EQ-5D index were examined using the same analysis.
  
  
  RESULTS
  Four hundred and twenty-two subjects were included in the analysis. The adjusted means for the EQ-5D index were significantly lower when the SPPB score was abnormal (p=0.022 for men, p=0.047 for women). An abnormal SPPB score was significantly associated with the lowest quartile of EQ-5D index score (adjusted OR 3.54 in the lowest quartile for men; adjusted OR 2.50 and 3.37 in the lowest and second quartiles for women). Gait speed was significantly associated with the EQ-5D index for participants of both sexes, but standup time was associated with the EQ-5D index only for men.
  
  
  CONCLUSIONS
  An abnormal SPPB score was associated with lower QOL. Thus, the SPPB has the potential to be used as an early predictor of declining QOL in clinical settings and epidemiological studies.
authors.affiliation: Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Bumjo
authors.initials: B
authors.lastname: Oh
authors.affiliation: Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea. Electronic address: belong.cho@gmail.com.
authors.forename: Belong
authors.initials: B
authors.lastname: Cho
authors.affiliation: Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Ho-Chun
authors.initials: HC
authors.lastname: Choi
authors.affiliation: Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Ki-Young
authors.initials: KY
authors.lastname: Son
authors.affiliation: Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Sang Min
authors.initials: SM
authors.lastname: Park
authors.affiliation: Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Sohyun
authors.initials: S
authors.lastname: Chun
authors.affiliation: Division of Epidemiology, School of Public Health, Seoul National University, Seoul, Republic of Korea.
authors.forename: Sung-Il
authors.initials: SI
authors.lastname: Cho
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology* / Q000523:psychology; D004185:Disability Evaluation; D005080:Exercise Test / Q000379:methods; D005260:Female; D005684:Gait / Q000502:physiology*; D015577:Geriatric Assessment / Q000379:methods; D006801:Humans; D007866:Leg / Q000502:physiology*; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D008609:Mental Status Schedule; D008875:Middle Aged; D004856:Postural Balance / Q000502:physiology; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics / Q000379:methods; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D056910:Republic of Korea; D011795:Surveys and Questionnaires; D016138:Walking / Q000502:physiology
keywords: EQ-5D; Elderly person; KLoSA; Physical function; QOL; SPPB