Point and interval estimates of percentile ranks for scores on the texas functional living scale

John R. Crawford, C. Munro Cullum, Paul H. Garthwaite, Emma Lycett, Kate J. Allsopp

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Point and interval estimates of percentile ranks are useful tools in assisting with the interpretation of neurocognitive test results. We provide percentile ranks for raw subscale scores on the Texas Functional Living Scale (TFLS; Cullum, Weiner, & Saine, 2009) using the TFLS standardization sample data (N=800). Percentile ranks with interval estimates are also provided for the overall TFLS T score. Conversion tables are provided along with the option of obtaining the point and interval estimates using a computer program written to accompany this paper (TFLS-PRs.exe). The percentile ranks for the subscales offer an alternative to using the cumulative percentage tables in the test manual and provide a useful and quick way for neuropsychologists to assimilate information on the case's profile of scores on the TFLS subscales. The provision of interval estimates for the percentile ranks is in keeping with the contemporary emphasis on the use of confidence intervals in psychological statistics

Original languageEnglish (US)
Pages (from-to)1154-1165
Number of pages12
JournalClinical Neuropsychologist
Issue number7
StatePublished - Oct 1 2012


  • Bayesian methods
  • Computer scoring
  • IADLs
  • Interval estimates
  • Percentile norms

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Psychiatry and Mental health
  • Clinical Psychology
  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)


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