title: The reliability and validity of the Life Satisfaction Index-A with survivors of traumatic brain injury.
abstract: OBJECTIVE
  To investigate the internal consistency, long-term stability and validity of the Life Satisfaction Index-A (LSI-A) in a sample of survivors of traumatic brain injury (TBI).
  
  
  METHODS
  Cohort study.
  
  
  METHODS
  LSI-A was administered to survivors of TBI at 12, 24, 48 and 60 months post-injury during telephone interviews. Participants rated their quality of life, independence and participation in activities as well as health status at 24 months. Internal consistency was evaluated with Coefficient alpha. Pearson's r was used to investigate score stability. Test validity was explored with Pearson's r and Analysis of Covariance with age and sex as covariates.
  
  
  METHODS
  None.
  
  
  RESULTS
  Coefficient alphas ranged from 0.85-0.92. Test-re-test coefficients ranged from 0.42-0.77. The LSI-A was positively correlated with self-reported quality of life, independence, activity level and health status.
  
  
  CONCLUSIONS
  The LSI-A is a reliable and valid measure of the construct of life satisfaction among survivors of TBI.
authors.affiliation: Auburn University Montgomery, AL 36124-4023, USA. slobello@mail.aum.edu
authors.forename: Steven G
authors.initials: SG
authors.lastname: Lobello
authors.forename: Andrea T
authors.initials: AT
authors.lastname: Underhill
authors.forename: Philip R
authors.initials: PR
authors.lastname: Fine
mesh_terms: D000203:Activities of Daily Living; D000223:Adaptation, Psychological; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001294:Attitude to Health; D001930:Brain Injuries / Q000523:psychology* / Q000534:rehabilitation; D005260:Female; D006304:Health Status; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D017741:Survivors / Q000523:psychology*