title: Test-retest reliability and agreement of the Satisfaction with the Assistive Technology Services (SATS) instrument in two Nordic countries.
abstract: OBJECTIVE
  The purpose of this study was to investigate test-retest reliability, agreement, internal consistency, and floor- and ceiling effects of the Danish and Finnish versions of the Satisfaction with the Assistive Technology Services (SATS) instrument among adult users of powered wheelchairs (PWCs) or powered scooters (scooters).
  
  
  METHODS
  Test-retest design, two telephone interviews 7-18 days apart of 40 informants, with mean age of 67.5 (SD 13.09) years in the Danish; and 54 informants with mean age of 55.6 (SD 12.09) years in the Finnish sample.
  
  
  RESULTS
  The intra-class correlation coefficient varied between 0.57 and 0.93 for items in the Danish and between 0.41 and 0.93 in the Finnish sample. The percentage agreement varied between 54.2 and 79.5 for items in the Danish and between 69.2 and 81.1 in the Finnish sample, while the Cronbach's alpha values varied between 0.87 and 0.96 in the two samples. A ceiling effect was found in all items of both samples.
  
  
  CONCLUSIONS
  This study indicates that the SATS may be reliably administered for telephone interviews among adult PWC and scooter users, and give information about aspects of the service delivery process for quality development improvement purposes. Further psychometric testing of the SATS is required.
authors.affiliation: Department of Assistive Technology, The Norwegian Labour and Welfare Service , Oslo , Norway .
authors.forename: Terje
authors.initials: T
authors.lastname: Sund
authors.forename: Susanne
authors.initials: S
authors.lastname: Iwarsson
authors.forename: Heidi
authors.initials: H
authors.lastname: Anttila
authors.forename: Tina
authors.initials: T
authors.lastname: Helle
authors.forename: Ase
authors.initials: A
authors.lastname: Brandt
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003718:Denmark; D005260:Female; D005387:Finland; D006801:Humans; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D015203:Reproducibility of Results; D012656:Self-Help Devices; D011795:Surveys and Questionnaires
keywords: Assistive technology; instrument development; intra-observer reliability; powered wheelchairs; psychometric testing; rehabilitation; scooters; service delivery