title: Rasch analysis of the WHOQOL-BREF in post polio syndrome.
abstract: OBJECTIVE
  The World Health Organisation quality of life abbreviated scale (WHOQOL-BREF) was developed as a measure of quality of life across 4 separate health domains; physical health, psychological, social relationships and environment. This study evaluated the validity of the WHOQOL-BREF in post-polio syndrome by testing it for fit against the Rasch model.
  
  
  RESULTS
  The scale was posted to 319 volunteers, 271 (85%) completed the scale with a mean age of 66.7 years (standard deviation 8.15); 64% were female. The social relationships domain fitted the Rasch model (χ2 p = 0.19) but reliability was low (α = 0.69) and there were insufficient items to test the assumption of unidimensionality. Solutions were derived for physical health (p = 0.45, t-test = 1.5%, α = 0.67), psychological (p = 0.19, t-test = 4.9%, α = 0.78) and environment domains (p = 0.48, t-test = 6.0% - lower confidence interval 3.4%, α = 0.80) by accounting for local dependence and to cancel out differential item functioning. An overall measure of quality of life, which combined all 4 domains was validated (p = 0.80, t-test = 4.6%, α = 0.81). A transformation table for this total score is provided.
  
  
  CONCLUSIONS
  The 4 domains of the WHOQOL-BREF provide valid measures of quality of life in post-polio syndrome. The summed score was more reliable and better targeted and can be used as an ordinal estimate of quality of life.
authors: Department of Neurology, Walton Centre for Neurology and Neurosurgery, L9 7LJ Liverpool, United Kingdom. ian.pomeroy@thewaltoncentre.nhs.uk, impomeroy@gmail.com.
authors: Ian M
authors: IM
authors: Pomeroy
authors: Alan
authors: A
authors: Tennant
authors: Carolyn A
authors: CA
authors: Young
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016262:Postpoliomyelitis Syndrome; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires