Related Experiment Video
Updated: Jun 3, 2026
Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
Published on: January 8, 2020
Comparison of 90-day case-fatality after ischemic stroke between two different stroke outcome registries using
1Department of Neurology, Hallym University Sacred Heart Hospital, Anyang, Korea. ykh1030@hallym.ac.kr
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.
Related Concept Videos
01:20Comparing the Survival Analysis of Two or More Groups
01:15Ischemic Stroke l: Introduction