title: Comparison of 90-day case-fatality after ischemic stroke between two different stroke outcome registries using propensity score matching analysis.
abstract: BACKGROUND
  It has not been clarified whether the disparity in ischemic stroke outcome between populations is caused by ethnic and geographic differences or by variations in case mix. Propensity score matching (PSM) analysis can overcome some analytical problems but is rarely used in stroke outcome research. This study was to compare the ischemic stroke case-fatality between two PSM cohorts of Sweden and Korea.
  
  
  METHODS
  Prognostic variables related to baseline characteristics and stroke care were included in our PSM model. Then, we selected 7675 Swedish and 1220 Korean patients with ischemic stroke from each stroke registers and performed one-to-one matching based on propensity scores of each patient.
  
  
  RESULTS
  After PSM, all measured variables were well balanced in 1163 matched subjects, and the 90-day case-fatality was identical 6.2% (HR 0.997, 95%CI 0.905-1.099) in Sweden and Korea.
  
  
  CONCLUSIONS
  No difference is found in the 90-day case-fatality in propensity score-matched Swedish and Korean patients with ischemic stroke.
authors.affiliation: Department of Neurology, Hallym University Sacred Heart Hospital, Anyang, Korea. ykh1030@hallym.ac.kr
authors.forename: K-H
authors.initials: KH
authors.lastname: Yu
authors.forename: K-S
authors.initials: KS
authors.lastname: Hong
authors.forename: B-C
authors.initials: BC
authors.lastname: Lee
authors.forename: M-S
authors.initials: MS
authors.lastname: Oh
authors.forename: Y-J
authors.initials: YJ
authors.lastname: Cho
authors.forename: J-S
authors.initials: JS
authors.lastname: Koo
authors.forename: J-M
authors.initials: JM
authors.lastname: Park
authors.forename: H-J
authors.initials: HJ
authors.lastname: Bae
authors.forename: M-K
authors.initials: MK
authors.lastname: Han
authors.forename: Y-S
authors.initials: YS
authors.lastname: Ju
authors.forename: D-W
authors.initials: DW
authors.lastname: Kang
authors.forename: P
authors.initials: P
authors.lastname: Appelros
authors.forename: B
authors.initials: B
authors.lastname: Norrving
authors.forename: A
authors.initials: A
authors.lastname: Terent
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002545:Brain Ischemia / Q000401:mortality*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011379:Prognosis; D057216:Propensity Score; D012042:Registries; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D020521:Stroke / Q000401:mortality*; D013548:Sweden / Q000453:epidemiology; D016896:Treatment Outcome