title: Test-retest of computerized health status questionnaires frequently used in the monitoring of knee osteoarthritis: a randomized crossover trial.
abstract: BACKGROUND
  To compare data based on touch screen to data based on traditional paper versions of questionnaires frequently used to examine patient reported outcomes in knee osteoarthritis patients and to examine the impact of patient characteristics on this comparison
  
  
  METHODS
  Participants were recruited from an ongoing trial (http://ClinicalTrials.Gov Identifier: NCT00655941). 20 female participants, mean age 67 (SD 7), completed KOOS, VAS pain, function and patient global, SF-36, Physical Activity Scale, painDETECT, and the ADL Taxonomy. Patients were randomly assigned to one of two subgroups, completing either the paper or touch screen version first. Mean, mean differences (95% CI), median, median differences and Intraclass Correlation Coefficients (ICCs) were calculated for all questionnaires.
  
  
  RESULTS
  ICCs between data based on computerized and paper versions ranged from 0.86 to 0.99. Analysis revealed a statistically significant difference between versions of the ADL Taxonomy, but not for the remaining questionnaires. Age, computer experience or education-level had no significant impact on the results. The computerized questionnaires were reported to be easier to use.
  
  
  CONCLUSIONS
  The computerized questionnaires gave comparable results to answers given on paper. Patient characteristics did not influence results and implementation was feasible.
authors.affiliation: The Parker Institute, Frederiksberg Hospital, Nordre Fasanvej 57, 2000 Frederiksberg, Copenhagen, Denmark.
authors.forename: Henrik
authors.initials: H
authors.lastname: Gudbergsen
authors.forename: Else M
authors.initials: EM
authors.lastname: Bartels
authors.forename: Peter
authors.initials: P
authors.lastname: Krusager
authors.forename: Eva E
authors.initials: EE
authors.lastname: Wæhrens
authors.forename: Robin
authors.initials: R
authors.lastname: Christensen
authors.forename: Bente
authors.initials: B
authors.lastname: Danneskiold-Samsøe
authors.forename: Henning
authors.initials: H
authors.lastname: Bliddal
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D018592:Cross-Over Studies; D004185:Disability Evaluation; D005260:Female; D006304:Health Status; D006801:Humans; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000175:diagnosis* / Q000503:physiopathology; D010147:Pain Measurement; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D014584:User-Computer Interface