title: Evaluation of continuous summary physical performance scores (CSPPS) in an elderly cohort.
abstract: OBJECTIVE
  Physical performance is an important predictor of quality of life among the elderly. A valid and sensitive measure of physical performance is needed in order to evaluate possible interventions. The aim of this study was to examine the validity and reliability of the Continuous Summary Physical Performance Score (CSPPS) and its relationship to the Quartile Summary Physical Performance Score (QSPPS).
  
  
  METHODS
  This cross-sectional study of an elderly cohort from 5 centers in the US and Europe included men and women (> age 65) reporting at least two domains of disability. Subjects completed assessments of mobility and ability to perform activities of daily living (ADLs), the physical component of the SF-36, and a self-rating of physical performance. Timed physical performance tests were used to calculate the CSPPS and QSPPS.
  
  
  RESULTS
  216 subjects took part (mean age = 81 years). The distribution of CSPPS scores was similar for men and women, with a mean of 59.2 (SD 17.8), median of 64.3, and range from 1.3 to 91. Subjects with older age, higher degree of disability, and lower self-rated physical performance had lower CSPPS scores. The CSPPS had good test-retest reliability (r = 0.92), and CSPPS and QSPPS are highly correlated (r = 0.94, p < 0.001). However, the QSPPS appears to lack the linearity, and the ranges of the CSPPS for each score of the QSPPS overlap substantially.
  
  
  CONCLUSIONS
  In a cohort with moderate to severe disability, the CSPPS appears to be a valid, reproducible measure that can discriminate smaller yet clinically meaningful differences in physical function, as compared with the QSPPS.
authors.affiliation: Clinical Research Center, Helen Hayes Hospital, Route 9W, West Haverstraw, NY 10993, USA. jerinieves@mindspring.com
authors.forename: Jeri W
authors.initials: JW
authors.lastname: Nieves
authors.forename: Marsha
authors.initials: M
authors.lastname: Zion
authors.forename: Marco
authors.initials: M
authors.lastname: Pahor
authors.forename: Roberto
authors.initials: R
authors.lastname: Bernabei
authors.forename: Jacobijn
authors.initials: J
authors.lastname: Gussekloo
authors.forename: Henry
authors.initials: H
authors.lastname: Simon
authors.forename: Jong-Soon
authors.initials: JS
authors.lastname: Park
authors.forename: Tracy
authors.initials: T
authors.lastname: Li
authors.forename: Pablo
authors.initials: P
authors.lastname: Lapuerta
authors.forename: G Rhys
authors.initials: GR
authors.lastname: Williams
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D006233:Persons with Disabilities; D005260:Female; D015577:Geriatric Assessment / Q000379:methods*; D018737:Hand Strength; D006801:Humans; D008297:Male; D051346:Mobility Limitation; D009043:Motor Activity; D004856:Postural Balance; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires